The recent IDE updates introduced a few changes that Arbed didn’t handle, yet.
I should now have it all fixed.
Would those using Arbed occasionally please download this beta version and let me know if Arbed reports any troubles opening your project(s):
Nothing critical. Just the information we already mailed about
Oh, I had forgotten about your report. Thanks for the reminder.
New version 1.8.6 is available now, supporting project format changes in Xojo 2016r4 or 4.1.
See here: http://www.tempel.org/Arbed/