Comment 9 for bug 91786

"But anyway, this might already have been fixed in compiz. The release included in jaunty doesn't seem to have this problem."

Absolutely not true for me. I am up to date with the Jaunty releases. This "bug" is still present. nxsty, I suggest you verify your settings are at "auto" only for window types, and turn up the opacity and radius settings, then confirm you no longer see this behavior.