Revision: 0135
OS: Ubuntu Linux 7.04 i386, KDE desktop

Launch Processing.
File->Save As...
PDE appears to hang.

ps aux | grep Processing reveals this process:

badzmaru 13220 0.8 0.4 22528 9420 pts/2 S+ 00:38
0:00 /home2/badzmaru/Processing/processing-0135/java/lib/i386/gtkhelper
gtk-cancel 4 ltr gtk-dialog-error 6 ltr gtk-di
alog-info 6 ltr gtk-dialog-question 6 ltr gtk-dialog-warning 6 ltr gtk-no 4 ltr gtk-ok 4
ltr gtk-yes 4 ltr

killing it brings everything back to normal, the Save As dialog appears, everything
continues swimmingly.

Corollary, though not a bug: is it possible to configure PDE to use KDE instead of
Gnome? For example, to have "Show Sketch Folder" launch Konqueror instead of
Nautilus.

we don't launch gtk-helper, that's a problem with your setup.

for the latter, read the linux section of the environment reference.
http://processing.org/reference/environment/platforms.html#linux

however we do use the gtk look and feel classes, so maybe that's at least
the trigger... though that's still gonna be a java/distro bug, not
something i can do anything about.