I'm running Slackware64 13.37 with Robby Workman's Xfce 4.8.
I can't seen to be able to start GIMP. Here's what happens when I try to start it in a terminal.
[kikinovak@alphamule:~] $ gimp
(gimp:9898): GLib-WARNING **: goption.c:2132: ignoring no-arg, optional-arg or filename flags (8) on option of type 0