I've tried it with gnome, and can confirm that the error occurs there as well.
This bug makes developing Java applications on natty really *%$!...
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https://bugs.launchpad.net/bugs/778075
I confirm this. I got the same error on a fresh installation of 11.04
(32bit).
/var/log/kern.log.1:May 2 10:24:09 roberto kernel: [230110.568765]
unity-window-de[11839]: segfault at 228 ip 0805be37 sp bfe85ed0 error 6 in
unity-window-decorator[8048000+17000]
/var/log/kern.log.1:May 2 10:45:59
