Speaking of the devil ...
My apologies, the text window issue seems to be GIMP related.
OTOH now, for the very first time, GIMPs main window hides it's head
under the panel by just opening GIMP. I didn't move the window manually.
This seems to be openbox related.
http://picpaste.com/window_issue.png
resp.
http://picpaste.com/pics/window_issue.1410700765.png
:(