I experienced a similar problem. I don't know about error messages as I started GIMP directly and not via a console. But I had a working stylus and eraser but when using to mouse, I got no effect on the image, no matter what drawing tool I used. I figured out that disabling _all_ extended input devices made my mouse work again, although the stylus was now no longer pressure sensitive (seems reasonable). But when I now enabled the stylus and eraser again (set to Mode: Screen) everything worked as expected! The mouse resulted in effects as well as the stylus/eraser including pressure sensitivity. However, when I changed the characteristics of the stylus using wacomcpl, I ran into the same problem again. It could be fixed with the disable + enable procedure. So apparently, when using wacomcpl, it must mix up something in the configuration so that GIMP needs to "reset" the extended input devices.
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