Strange behaviour when updating multiple tests

Hi,

after upgrade from QC 10.00 to ALM 11.52 I detected a strange behaviour in test plan in one of our projects:

when I select multiple tests in Test Plan->Grid View and try to update via "right-click->Update Selected" I can choose an Update Field and a Value. Afterwards I get the message that all selected fields were updated and in the Grid View the desired values are shown. But when I click on "Refresh all" I can see that only some of the selected tests were updated and some are still unchanged.

Is this problem known? Any ideas?

Best Regards,

Christoph