Catalyst - 3:34 pm on Sep 28, 2011 (gmt 0)
The system error is a known issue that's been going on for awhile now. Sometimes with errors like that, trying other browsers can help - but not always.
There are a number of other MAJOR bugs right now too. One I uncovered yesterday that was affecting lots of users was the double phone # bug. Every time anyone made even a tiny Places edit their phone data would get corrupted and double up. I contacted Google and they fixed it in a day.
However other bugs like the one you experienced, the area served bug and some others still remain.
Theory is there is a big update on the way. Things typically go wonky on Places when a new update is coming.