The original intent of this thread was to record my efforts
to cope with occasional X-crashes when using Knoppix 6.4.4.
I originally suspected LXDE, PCManFM, and Compiz as the
most likely culprits. I now believe those suspicions were
misplaced.

Prior to my Knoppix 6.4.4 experience, I'd used OpenOffice
virtually daily for years with no problems. Recently, I can
say I've used Knoppix 6.4.4 virtually daily for months.
I now have the strong feeling that any current video
problems I am having are best described as LibreOffice-related.
These problems seem to be described by others as crash-on save
or crash-on-close, are common to both LibreOffice and
OpenOffice, and for both spread-sheets and word processors.
In my cases, some prior cut-and-paste machinations usually
precede an 'outage'.

Bug reports I've seen don't give me any comfort that 'the
developers' have any ideas on what the problem might be.
I haven't even seen any work-arounds that I can recall.
In my case, control-alt-backspace returns my control, and
I don't think I've lost any data because of this nuisance.

Here's a complaint that seems typical enough:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=614182