I think I have this problem licked, but I just wanted to bounce it off of everyone... I was having trouble with the iCal widget and with iCal crashing, and I rebooted. Upon reboot, I had the following problems: - iCal would invariably lock if run - Address Book would invariably lock if run - iSync would hang before making a connection to my phone - iCal Events would hang on the preferences side of the widget I screwed around with plists and so on, to no avail. After that I even started having trouble with Mail.app sending messages. Oddly, Safari and Adium continued to work fine, and Mail.app could read existing messages. I finally noticed in my activity monitor, that mdimport was using a huge proportion of system resources. Killing it seems to have addressed the problem (it restarted automatically at a normal utilization level). After that, all the aforementioned apps and widget seem to work normally. Whew! Unfortunately, resetting sync history was something I tried while trying to find a fix. So right now, iSync is slowly getting all the data from my cell phone. I think I've done this before, and the result was not disastrous in the sense of data loss in iCal or AdBook. So if that works, I am back out of the woods. But mein Gott in Himmel! Anyways, wanted to share. Anyone else have this problem? Do I need to do anything else? Strange that a problem with an out-of-control instance of mdimport would persist over a reboot.