I changed the palette to the Echo Icon Theme Palette and that didn't fix anything. But I noticed that that palette doesn't produce a scrollbar, and a lightbulb went on in my head. So after a little googling, I:
# sudo apt-get remove liboverlay-scrollbar-0.2
And now Inkscape (along with everything else) has plain-jane GTK scrollbars, but pressure sensitivity works!
WORKAROUND GET
I changed the palette to the Echo Icon Theme Palette and that didn't fix anything. But I noticed that that palette doesn't produce a scrollbar, and a lightbulb went on in my head. So after a little googling, I:
# sudo apt-get remove liboverlay- scrollbar- 0.2
And now Inkscape (along with everything else) has plain-jane GTK scrollbars, but pressure sensitivity works!