Hi Erik,
I created the repository using "svnadmin create" on common-lisp.net. Then I exported the existing repository on bknr.net using "svnadmin dump" and imported it on common-lisp.net using "svnadmin load". I followed the Subversion manual doing that, things seemed to work just fine. I use subversion-1.1.3 on my development system, bknr.net is running subversion-1.2.1. I checked in a few changes to the repository yesterday, without any problems. I did not freshly check out, though, but rather modified all the .svn/entries files in my checkout so that they point to the new location. I am using svn+ssh as the protocol.
I hope this helps, let me know if you need more information.
-Hans