It is a stand alone Pi. There are other apps running, that we built, but this is the only Web App. The others are console to do special stuff.
It is re-creatable, happens within a few minutes of use - as in just watching the screen.
This is something that just started recently. I could go back and try earlier releases to see if they are also a problem - but have not gotten any negative feedback either.
What is interesting and frustrating is that the Session.Close nor the App.Close /Stop/Unhandled exceptions are never raised.
One thing that I did notice is there are System logs referring to Fonts.
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: line 5: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: line 6: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: line 9: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-hinting-slight.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 76: non-double matrix element
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 76: non-double matrix element
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 84: saw unknown, expected number
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/11-lcdfilter-default.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/11-lcdfilter-default.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/11-lcdfilter-default.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/20-unhint-small-vera.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/20-unhint-small-vera.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/20-unhint-small-vera.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/30-metric-aliases.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/30-metric-aliases.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/30-metric-aliases.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/40-nonlatin.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/40-nonlatin.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/40-nonlatin.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-generic.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-generic.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-generic.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-latin.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-latin.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/45-latin.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/49-sansserif.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/51-local.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/51-local.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/51-local.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-generic.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-generic.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-generic.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-latin.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-latin.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/60-latin.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/65-fonts-persian.conf", line 34: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/65-fonts-persian.conf", line 35: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/65-nonlatin.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/65-nonlatin.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/65-nonlatin.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/69-unifont.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/69-unifont.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/70-no-bitmaps.conf", line 8: unknown element "description"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/80-delicious.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/80-delicious.conf", line 5: unknown element "its:translateRule"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/90-synthetic.conf", line 4: unknown element "its:rules"
Oct 30 19:46:16 axcys AxcysEmbeddedViewer[12514]: Fontconfig warning: "/etc/fonts/conf.d/90-synthetic.conf", line 5: unknown element "its:translateRule"
Also, this error which I am looking into but do not yet know what it pertains to or means, other than the obvious.
Oct 30 19:48:29 axcys AxcysEmbeddedViewer[12514]: Error 116 of type 33554432: WriteFText: Operation canceled!
Tim