iCal corrupted with white screen

I checked with Apple Support and she had me discard my calendars folder and resubscribe to moblile me. This worked on one computer but not the other in my office. After a day of working ok the first computer had the same problem. Curiously, when I opened Mail today, I received a message that there was one To Do item that disagreed on Mobile Me versus my MacPro. When I opened iCal, it was corrupted as described in 4/1 post. Rather strange that identical problem on 2 different macs?

this keeps getting stranger and stranger. I now have this problem on a third computer (MacBook Air). Same issue: screen won't completely draw and unresponsive so I have to quit iCal. If I open preferences in iCal, they won't close unless I quit or force-quit iCal.

There's probably some kind of conflict with other software but no idea what it is. Problem just seemed to occur out of the blue

I am still having the problem where iCal on 3 different Macs will lock up on opening. Typically, part of screen will draw such as April’s events but not the To Do list or Calendar column on left side of iCal screen; months won’t advance; view can not be changed; preferences will open but won’t close unless quit; sometimes calendar is totally empty and rarely just a white screen. Following Apple Tech Support recommendation, I turned off syncing / unregistered the Mac in MobileMe / and signed off of MobileMe. I deleted Calendars folder in Library, and replaced with a backup from a week before the problem, and then replaced MobileMe iCal with that on local Mac. This seemed to work for a day or two, but alas the calendar froze up as before when I opened on my MacBook Air which was not online at the time (actually in an airplane). All 3 Macs are having this problem. If do the above, then iCal works for a day or so and then freezes as before. Curiously, syncing with iPhone works ok.

I suspect there is another corrupted file that I need to discard because:
1. turn off syncing / unregister the Mac in MobileMe / and sign off of MobileMe.
2. delete Calendars folder in Library
3. go offline so no access to MobileMe
4. when I open iCal, I get a fresh empty calendar (except for birthdays) with a message that “There are 3 sync conflicts involving Calendars” between iCal and MobileMe – it then asks me to choose color for Birthdays, Work, and Home calendars since I changed earlier form default.
There must be a MobileMe file that has this info on my Mac. I need to know what else to delete. When I do steps 1-4, and then sync with MobileMe, iCal works for a while but jams as before after a day or so.

Sorry for the long post but working with Apple Tech Support and it may be helpful to them?

I suspect something has changed in MoblieMe. Typically, Apple quietly fixes bugs and problems go away as mysteriously as they appeared.

I have been investigating this problem and have the following info and a "pseudo-fix"

1. This happened on 3 different macs when syncing with or replacing with MobileMe calendar/address book. As noted above by others, sometimes I get a white screen but usually month calendar (which can't be edited) and empty side bars; I can't move to other months. It appears that iCal is freezing on loading/drawing calendar.

2. Syncing to my iPhone works ok and reminders do come up on my Mac so iCal seems to be working but just not drawing the screen.

3. Address book works fine

4. If I delete Calendars folder in library and iCal preferences, restart, and then sync with MobileMe, iCal works ok initially but within a day the problem recurs even if not connected to internet. Apple tech said that my iCal must be corrupted, but I think not due reason discussed below in item 5.

5. If I make a clean new user, and sync with MobileMe, then iCal works. I have done this now for over a month and it's stable. Curiously, I did try moving the Calendars folder from the library of my standard user to the new user library folder, and iCal froze up. I deleted the user and made another bare new user and iCal is working ok on several macs.

6. I think that some app is interfering with iCal in my stander user. e.g. I run Quickeys and variety of other stuff, and this is not running in the new "bare" user. I also have adobe CS3 (and 4), MSO 2008, VPN, Skype, etc. etc. so I have no idea which app is conflicting or how.

7. As far as my "pseudo-fix", I enter new events via Safari directly into MobileMe and then sync with my macs. This will give me reminder-alarms and allows syncing with iPhone. Every so often (maybe 1-2x per week), I log into my new user account, sync with MobileMe, and then add alarms to needed events in iCal (I haven't figured out how to do this in Safari).

8. I suspect that Apple will quietly fix this bug in a future update and the problem will go away - this is typically what this "infallible" company does so they don't have to admit a problem. My current setup works but it's a hassle and I wish I had not abandoned Now-Up-To-Date, but I don't want to re-enter a bazillion events into a new calendar program.

9. I need to keep a record of past events: I did output the calendar as a pdf so if I ever decide to abandon MobileMe and iCal, I will at least have a record.

Hope this helps

I'm running 10.5.7 OS now. I deleted calendar folder and iCal preferences. Unregistered my mac from MobileMe. Then registered and replaced calendar/address-book with MobileMe version. Unfortunately, the problem immediately recurred. Seems like some process is interfering with screen redraw of iCal (as before). ;-(