I note from the Apple support site that there is a known issue with al iMacs when upgrading to Leopard from 10.4 where you end up stuck in a loop at the log in screen. The solution is apparently an archive and install... However I upgraded weeks ago without any problems and suddenly today I cannot access my main user. Has anyone else experienced this? I can archive and install if I must, but I don't want to have to do this every few weeks - that's not why I bought an Apple... Any ideas how to fix this?