Hi.
Some people have been looking into this.. Are there any news?
I remembered this old Mail from Lennart Borgman:
"Status bar gets face Mode Line Inactive after Alt-Tab"
http://lists.gnu.org/archive/html/emacs-devel/2004-12/msg00366.html
This seems to have the same cause as those problems with the tooltips
on w32. When i use Alt-Tab the mode line does not get updated (still
the mode-line-inactive face) while it gets updated (mode-line face)
when using C-x 5 o.
Jason Rumney said it could be that the focus gained messages from the
OS are not handled correct. Any tips to were i could start looking
for clues? So far my knowledge of the emacs internals is very low..
Stephan