When you want to get rid of a plugin you first have to delete it and then click on "show deleted" and then on purge. Then wait for some random time with constantly refreshing the plugins page until the plugin is finally gone. We need to make that more obvious See also Bug 683609 and Bug 815734 The server might put a message into the message center when the purge has finally happened in the backend. Also if a user tries to upload a new version of the plugin that is to be purged, the upload works, but the plugin "just vanishes" without the user having a clue what is going on.
I think this is solved by BZ 1076104. If you disagree, please reopen.
Bulk closing of RHQ 4.11 issues, now that RHQ 4.12 is out. If you find an issue with those, please open a new BZ, linking to the old one.