Comment 29 for bug 196058

Same here.
During upgrade from 13.04 to 13.10 I had some problems in compiz/3d acceleration/desktop elements (panel disappeared) and so on.
I was using thunderbird and it remembered the "wrong fullscreen" position.
After some tricks and updates my desktop was ok but thunderbird always started fullscreen, no matter what.
Editing the localstore.rdf from:
                    width="1539"
                    height="847"
                    sizemode="fullscreen" />
to
                    width="800"
                    height="600"
                    sizemode="normal" />
solved the problem.
Thanks all for the hints