The problem has increased to graphical artifacts on various parts of the
desktop, to the point of it becoming a jumbled patchwork of image fragments.
Even opening the logs caused graphical glitches and a system freeze.
In earlier versions of Trisquel, I sometimes experienced freezes as well, but
those seemed to be resolved by using a proprietary video driver, or (after
Trisquel started actively undermining lay users' ability to install non-free
drivers), switching to VLC and/or disabling compositing.
But this time around it's far beyond nuisance level, plus there seems to be
no option to modify the compositing.
I will look into the suggestions you two have made, though testing on another
computer is not an option at this time.
