I think I have similar problems with Substrat (in the xscreensaver-data-extra package).
For those who cannot go in the sreensaver configuration screen, disable Desktop Effects before launching that tool, and it should just run fine.
I think I have similar problems with Substrat (in the xscreensaver- data-extra package).
For those who cannot go in the sreensaver configuration screen, disable Desktop Effects before launching that tool, and it should just run fine.