share problems after update to 24.4

Did update our single-server instance filr to 24.4 5 days ago. Today I found that  now on several users I'm no longer able to create or edit shares using the webinterface. Get no popup window or any error screen when trying to share a file. Some other users still able to share. The ones that does not work seems to be users with "a lot" of contents in their filr.

Any ideas rather than go to a backup from thursday?