One of my must-have programs is Unison-gtk for keeping my files backed up and syncronized. I was very disappointed when I could not create a new profile. Unison-gtk would crash when I tried to choose the directories/paths to synchronize. From the terminal I learned the following:
Google didn't help much about anything specific to Unison, but I eventually learned that this has something to do with gtk themes. I was using the oxygen-gtk theme. Changing themes seems to solve the problem. For example, Xfce-4.6 works. (Go to Menu -> Settings -> Appearance -> Style) Hope this helps other people. I gather from a crunch-bang forum (Sorry I don't have the link to it.) this may affect other programs like gedit. I believe this may be growing pains related to the shift from Gtk-2 to Gtk-3, but I don't know for sure.
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(unison-gtk:17949): Gtk-CRITICAL **: gtk_tree_model_filter_get_value: assertion `GTK_TREE_MODEL_FILTER (model)->priv->stamp == iter->stamp' failed (unison-gtk:17949): GLib-GObject-WARNING **: /tmp/buildd/glib2.0-2.36.4/./gobject/gtype.c:4239: type id `0' is invalid (unison-gtk:17949): GLib-GObject-WARNING **: can't peek value table for type `<invalid>' which is not currently referenced Segmentation fault