Transformer 8.4 tabs disabled

[lyonnesse]

I raised this elsewhere but I think it was the wrong place.

I can't order categories, change preferences or add descriptions.  Any pop-up menu with tabs  only lets me change the contents of the uppermost tab.

I've re-installed twice.  It works for a while, usually less than a day, and only intermittently.  Then I lose access to the tabs completely.

I this a known bug?  Or is there some kind of config I need to do?