Everything seems to work fine so far. However, one thing is a little strange: when I run full screen programs (Sprite.pb), after closing the screen/the program, the IDE window has the correct size, but the complete content (all the gadgets) have resized to the size of the fullscreen.
E.g.: the Sprite.pb example opens a 800x600 pixel screen, so all the gadget (but not the window) resize to that measurements. I have to manually resize the window, then the gadgets resize as well and everything is fine again.
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edit: Xubuntu 13.04, x86, PureBasic 5.20 B2, complete fresh install of OS and PB today, Sprite.pb example was not changed.