I have noticed this bug too, and have noticed that adding the following option to xorg.conf Device section(s) seems to work around it for the most part:
Option XaaNoOffscreenPixmaps "true"
Unfortunately this doesn't cure the molasses-slow scrolling, so for me Lyx is not yet usable in 7.10.
I have noticed this bug too, and have noticed that adding the following option to xorg.conf Device section(s) seems to work around it for the most part:
Option XaaNoOffscreenP ixmaps "true"
Unfortunately this doesn't cure the molasses-slow scrolling, so for me Lyx is not yet usable in 7.10.