FYI/More info on this problemo...
I just created a new test repository and get the same issue so I doubt this is specific to me. Example Url here:
Here is the more detailed error....
[lemonhead]$ svn checkout file:///home/username/svn/Test20060924 .
svn: Unable to open an ra_local session to URL
svn: Unable to open repository 'file:///home/username/svn/Test20060924'
svn: Error opening db lockfile
svn: Can't get shared lock on file '/home/username/svn/Test20060924/locks/db.lock': No locks available
I haven't heard back from support yet. Through google I found 2 reports of similar error messages but no resolution.