Hi Ravyn, sorry I missed your post there! The GL is supported differently in some machines and things can get funky the more you go off the "mainstream", so to say. I can only check for so many things and try my best to do my GL code by the book, but Verve is by its very nature off the beaten path, you know.
As for the pen stuff, I use the standard wintab library through Blitzmax tablet.mod and have to rely on what it provides thus far. There ain't much I can say about that, yet, either.
But all this is again a nice illustration for what happens, if you work without funding. Once I find a way to make that happen, funding would go into buying various devices and systems with different graphics cards and so to work on making it work on all of those. That also goes for mobile devices and different OS types (iOS, Android, mac).
All I can say right now is: Grrrrr!

...and I hope there will be a decent solution outside of my doing for now!

But I'm glad you came and wrote about it, of course! Needless to say that I'm happy you care for Verve!
Thank you for that and forgive me, please!