I can reproduce this bug with the radeon-driver. Everytime I hover over a footnote which contains a lot of text in LibreOffice compiz crashes.
The best workaround for me at this point is to deactivate all tooltips ('Tips' and 'Extended tips') in LibreOffice (Tools -> Options -> LibreOffice -> General). Debian Squeeze compiz 0.8.4-4 radeon 1:6.14.2-1~bpo60+1 libreoffice 1:3.4.6-2~bpo60+1
signature.asc
Description: This is a digitally signed message part