A (hopefully) bug fixed version of this sketch is online. There seemed to be a conflict in the event handling order of the controlP5 bang button that was used to load an image and the file selection window. To avoid this I removed the button, instead loading an image is now possible by pressing 'O'. I'm not sure, if this completely removed the bug. Please let me know, if sombody still encounters problems when loading a background image.
I tried it with 512 MB memory set in the Processing preferences and it worked. Did you check the checkbox in front of "Increase maximum available memory"? Because without, processing will not use the new settings.
Hi, thanks for the feedback. But this a message that I have almost all the time. The programm should still work if you have a tablet connected (and installed if necessary). Otherwise this programm will not draw anything.