I figured out my problem! After finally getting my client downgraded to 1.6, I found that svn commands were still hanging. As I mentioned in my original post, Comcast had reassigned my IP address while I was away, which has only happened once before in a number of years (when I power-cycled my cable modem). My server IPA references are normally handled through a shell environment variable. My svn working copies, however, use an entry in /etc/hosts instead, which I had forgotten about. After fixing that, I had 1.6 to 1.6 communication working, but then of course my modified 1.7 working copies could not be checked in. Since I was confident based on email to this list that 1.7 to 1.6 should work, I upgraded to 1.7 again in my client, checked in the 1.7 working copies, upgraded my remaining working copies, updated and checked in all mods, and everything seem to be working fine.
Thanks for the help - this was my first post to this list and I was impressed with the number of responses. While the problem had nothing to do with subversion, I appreciate the additional useful information. - Julius -- "Anybody who knows all about nothing knows everything" -- Leonard Susskind
