SVN access denied when comparing revisions

Question

Hello,

We're using an SVN repository. I am getting the error below when we try to compare a local unmodified file with the latest revision of the file in the repository. In other words, someone's checked in a change and if I update I will get their change but first I want to see what their change was. DOn't think it matters but we're using Xcode and using the menu item SCM -> Compare With -> Latest.

Error: 220001 (Item is not readable) Description: Unreadable path encountered; access denied

Any pointers where to look to fix this appreciated. I looked in the svnserve.conf which has the default settings. Nothing jumped out to me.

Also,

% svn log

returns "svn: Item is not readable".

Thanks, Gonzalo