eWeek: Tiger Bugs Break Networking Software. Apparently a lot of third-party VPNs and other networking programs don’t work with the Mac OS X update. Some are due to changes in the way the OS works, and some are apparently due to bugs in the OS.
So…did no one bother to test their software with the betas? Sure, you expect some things to break with any upgrade, but I can’t imagine these were all due to last-minute changes.