Commit failed Error after upgrading 1.7.7

[Bob Archer]

I recently upgraded Subversion edge to 3.2.0-3352.100 which gave me Subversion 
1.7.7.

Since then every now and then when I commit I get the following error:

Commit
Commit failed (details follow):
Server sent unexpected return value (500 Internal Server Error) in response to
 POST request for '/svn/manage/!svn/me'

Usually if I just retry the commit it works fine. Not a major issue, but a 
nuisance. 

Any ideas?