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When trying to start GIMP, get a dialog: GLib version too old (micro mismatch) The GIMP requires GLIB+ version 2.4.5 or later. Installed GLib+ version is 2.4.0 Somehow you or your software packager managed to install The GIMP with an older GLib+ version. Please upgrade to GLib+ version 2.4.5 or later. This is from a straight-as-I-can-tell, standard-repository-updated Fedora Core 3, not testing or devel. I've seen this for months, just figured everybody would see it and it would get fixed until I needed GIMP again. Apparently no FC users use GIMP, or I have a more localized issue. :) Be glad to do diagnostics or testing as needed.
Please include the exact versions of gimp, gtk2 and glib2 installed on your system ("rpm -q gimp gtk2 glib2"). "Updated FC3" doesn't help me much as you could either have updated from an out-of-sync mirror or I could have looked at this only later with no easy way to determine what was up to date when you issued this bug.
Using your command, I obtained this version info: $ rpm -q gimp gtk2 glib2 gimp-2.2.3-0.fc3.2 gtk2-2.4.14-2.fc3 glib2-2.2.3-1 glib2-2.4.0-1 No idea why I would have two glib2 packages installed, but doing yum remove glib2-2.2.3-1 produced Remove: ORBit2-devel.i386 1:2.8.2-1 Remove: glib2-devel.i386 1:2.2.3-1 Remove: gtk2-devel.i386 0:2.4.14-2.fc3 Remove: pango-devel.i386 0:1.6.0-7 Update: glib2.i386 0:2.4.8-1.fc3 Update: glib2-devel.i386 0:2.4.8-1.fc3 which solved the problem, GIMP now starts for me.