Hey there - I have trac+svn installed on a subdomain , using current install scripts. It seems a cron script is resetting permissions on /home/user/domains/sub.user.com/svn to 770, which results in Trac displaying an error:
SubversionException: ("Can't open file '/home/user/domains/sub.user.com/svn/svnname/db/current': Permission denied", 13)).
I'm able to fix this by doing chown -R o+rx /home/user/domains/sub.user.com/svn but it then gets reset, I believe by a cron job, but I haven't tracked that down, yet.
In case it may be of importance - this system uses LDAP for authentication.