This seems like a glitch to me, but please let me know if I'm doing something wrong ...
I'm running LR 4.3 on a slightly older machine. I just installed it today. Win7-32, Centrino duo, 3 GB of Ram. It`s not quick, but it's not unreasonably slow and everything seems to work, except for this annoying bug.
Expanding and contracting the panels doesn`t work properly ... for example, the "Publish Services" panel won't close. It flicks closed for a second, then opens again. The "Basic" panel won't open, unless I click on the arrow first, then the title. Some others work like normal, some don't open, some don't close. Some are eratic.
I thought it might help to try the "solo mode" people are talking about. This makes all the panels unresponsive. When I click off the panel area, all the panels disappear, even though right clicking lists them as visible. Nothing helps but shutting down LR and restarting.
... * good lord, now the forum has a bad gateway ... what's going on, Adobe?