Hi, I've noticed this across 3.4a-f. Turning off 'desktop icons' results in disapearing windows borders in compiz-fusion (weird). they come back if you adjust the setting again, and if you turn compiz-fusion off. It's consistent and reproducible. Not too huge a deal, as you can just delete icons from your desktop if you want, it just took me a while to figure out the cause. thanks.
HP tx2500: Sabayon
Acer Aspire One 9": ubuntu 9.04/backtrack/linuxmint mix-mess (not multiboot)
Acer Aspire One 10": +1