I have noted recently that if I close Lazarus and then later start it again sometimes (maybe 1 out of 3) the main window containing the menus and components list changes such that it covers half the screen vertically and only uses the left half of that window. Many menu commands are no longer accessible and the component tool bar seems to go vertically down the middle.
If I minimize Lazarus (the upper right corner buttons are still visible) and then restore it from the taskbar the view returns to normal.
Is this a known problem in the trunk version?
I am running version 1.5 svn 50023 from Oct 10, 2015.

Can you try, remove profile folder and retry run lazarus. This mean all setting will loose, so can backup profile folder before remove.

Bo Berglund wrote

Is this a known problem in the trunk version?

No.
You can indeed try with a clean configuration, either by deleting the local config dir or starting Lazarus with --pcp parameter. Environment options had a revamp recently. There is now a collection of desktops. Window positions and many other things are stored under a desktop.

If the problem persists then we need steps to reproduce.

Juha

OK,
but it will be in a couple of days because I am heading out to my vacation home to supervise digging operations...