Version:           1.2.0 (using KDE 4.4.2)
Compiler:          gcc
OS:                Linux (i686) release 2.6.32.11-99.fc12.i686.PAE
Installed from:    Fedora RPMs

The previous behavior when clicking the "Tags already assigned" button in the "Caption/Tags" tab would show all of the tags that had been assigned to the selected images.  The tags tree was fully expanded only showing tags applied to the selction.  This made reviewing my tagging changes very easy especially when asigning multiple tags found through the search box.

Now when I click the button it will only show me the highest level tags assigned. To see if other tags have been assigned I now need to expand each top level tag which shows both the assigned and unassigned children of that tag.  This basically requires manual inspection of all child tags to ensure that the proper ones are selected.

Also, if there is text in the search box clicking the "Tags already assigned" button will only show tags matching the text in the search box.  While this behavior is understandable and not unexpected I personally preferred the former behavior which was to show all tags assigned to the selected items.