When exporting or viewing documents LyX's main window is frozen: Only the status bar is updated and shows what happening in the background.
LyX's main window isn't udated so that when you switch to another application and go back to LyX, you'll only see the frame of the window and
you might think LyX is hanging. And even if you don't switch to another application you can't move or minimize the main window.
This is annoying especially for longer documents where the export could last up to minutes. I think this should be fixed for the next release,
perhaps only a refresh-call is missing. (This bug is also in LyX 1.4 and in 1.5svn.)
There's a bug report about this where it is additionally requested to be able
to continue the work in LyX while the export is running:
http://bugzilla.lyx.org/show_bug.cgi?id=412
regards Uwe
