Catalyst - 5:04 am on Mar 9, 2011 (gmt 0)
Sometimes things go south when Places is getting ready for a big update, so you may just need to wait another day or two. (There are so many problems lately that I HOPE they're working an upgrade that actually fixes things instead of just adding more new features.
Also sometimes when lots of people start reporting problems it turns out it only happens with certain browsers. So you can maybe try another browser.
I was in & out editing Place Pages all day today and didn't have have any errors. (Had to work through all kinds of other probs, but not that one.)
Based on all the bug reports in the forum I almost just skipped working on any listings today. But I didn't really have a choice since a new client had all kinds of merged duplicate problems and guideline violations I had to clean up - was afraid he was about to be rejected.
But again it was fine and I didn't hit any errors. I was using IE.
Hope this helps and best of luck!