Well I have all these troubles and more. I get that same warning about my iDisk local copy size being incorrect each time I wake from sleep or log-in, but here's my biggest problem. My .Mac prefpane under iDisk doesn't have the option to turn off/on a local copy. I'm not kidding. And I know I have a local copy, because I remember doing it. But for some odd reason, the controls for it don't show up anymore. I have no idea why, and without that I can't seem to fix my local iDisk.

Anyone have a clue why that would be happening? FYI, I emailed .Mac tech support days ago and have yet to hear from them. So much for support.

I turned off local copy. Quit system prefs. Logged out. (I waited about 15 minutes until mirror agent was quiet and let me logout.) Logged back in. Turned local copy back on. Wait for it to resync and you're good to go.

I did this on 2 machines, both 10.3.5 the day of the switch and it worked perfectly.