Strange Error - Transparent Property

I have an app I wrote back in 2013 that needed to be updated… Its nothing earth-shattering, a few windows, some text boxes and a few listboxes

There are 2 picture objects, used solely for displaying “icons”, any “transparent” attribute on any control is set to “off”
there is no specific “transparent=” code anywhere in the app…

the two pictures where “new picture(32,32,32)” and are now “new picture(32,32)”

still the same error?

UPDATE : The error ONLY occurs when I turn on HDPI support (which didn’t exist in 2013)