Currently Being ModeratedMar 27, 2012 6:15 AM (in response to G. L. Gray)
I have the same problem. As I use iCloud I did the following to see if it helped: a) stopped iCloud syncing (deleting the local calendars), b) threw away the ~/Library/Calendars folder and c) started up iCloud syncing again. I now have all the calendars back, but the Calendar Sync Changes folder has already started filling up again. By looking at the dates of these temporary files, they date back to Feb. 2, which I think is the same date as I updated to Mac OS X 10.7.3. My guess is that it came with that update. Hopefully Apple will submit a fix shortly.
Currently Being ModeratedMar 27, 2012 7:07 AM (in response to edsjo)
I am really surprised that no one else is commenting on this. As I said, 370,000 files in that folder was an insane number. Since my original post, I have created an iCal alarm with Automator that deletes these files every night and I have not seen any ill effects as a result of doing so. As you say, I hope Apple fixes this soon.
Currently Being ModeratedMar 27, 2012 8:57 AM (in response to G. L. Gray)
I've also had the same problem.
I only noticed it because my Super Duper backup kept hanging.
I ran all sorts of disk scans in case the HD was faulty, but noticed a Disk Warrier log stating I had more than 100,000 files in the Calendar Sync Changes folder.
When I looked I had more than 1.5 MILLION!
It took me a few hours to delete using Terminal and I too now have an Automator Workflow set up to delete them
I noticed when I opened iCal that it generated about 30 .tmp files every minute that it was open, nothing when I shut it down.
Hopefully this will get fixed but maybe Apple don't even know about it?
Currently Being ModeratedMar 27, 2012 9:10 AM (in response to Jonnygreen65)
I only had 517 000 files so you win! Anyway, I have submitted a bug report to Apple, not that I know if it helps. Are your problems correlated to the 10.7.3 upgrade? 10.7.3 was released Feb 1 and I am pretty sure I updated the day after, which is the same day these .tmp files started appearing.
Currently Being ModeratedMar 27, 2012 9:22 AM (in response to edsjo)
I'm afraid I can't be certain when my problem started.
It's quite possible it's since the update but I've only just found the problem
Currently Being ModeratedMar 28, 2012 11:02 AM (in response to G. L. Gray)
Anybody syncing to Google calendars through iCal? (I am)
Just wondering if the problem is coming from there?
Currently Being ModeratedMay 12, 2012 5:48 PM (in response to Jonnygreen65)
I also have this problem with about 15 users out of 30 on our network. I'm on 10.6.8 with home directories on an xserve. I have to clear about 50,000 files a week as it also creates a slow network.
There seems to be a problem with iCal not deleting the tmp files after a refresh of each calendar. I have created a new user account and the problem still exists.
I hope someone out there can tell us why this is happening.
Currently Being ModeratedMay 14, 2012 7:22 AM (in response to G. L. Gray)
Today I remembered to check the total space occupied by my .tmp files in “~/Library/Calendars/Calendar Sync Changes” and, to my surprise and delight, they are all gone! The command “find ~/Library/Calendars/Calendar\ Sync\ Changes -name '*.tmp'” returned absolutely nothing and the said directory is completely empty. Maybe it was fixed by the recent 10.7.4 update? Has anyone else observed the same phenomenon? Thank you all!
Currently Being ModeratedMay 14, 2012 9:29 AM (in response to jgmarcel)
I created an Automator event in iCal that would move all those *tmp files to the trash every night at a certain time. I added a Growl notification to tell me when it happened. Last night, I happened to be at the machine when this occurred and I looked in the trash to find that nothing had been moved there. So, to answer your question, I think this has been fixed in 10.7.4.
Currently Being ModeratedMay 14, 2012 9:33 AM (in response to G. L. Gray)
Great! Thanks for your input, G. L. Gray. Well done, Apple! ;-)
Currently Being ModeratedMay 14, 2012 1:08 PM (in response to jgmarcel)
It definitely seems to be fixed in 10.7.4. I checked on one of my machines where ~/Library/Calendars/Calendar Sync Changes had filled up quite a bit. After the update to 10.7.4, when i launched iCal, all the files were removed and no new ones seem to be accumulating.
Currently Being ModeratedMay 14, 2012 6:34 PM (in response to edsjo)
Still a problem with 10.6.8. Does anyone know what Apple did to fix it. I would love it fixed in 10.6.8 as we are not planning to upgrade until next year
Currently Being ModeratedJan 31, 2013 12:13 PM (in response to G. L. Gray)
Holy mackeral! I stumbled upon this thread while searching for cause for my marathon Time Machine backups. The log files indicated some 88K-92K files were being backed up, and I had no idea where they were. Now that I've excluded ~/Library/Calendars/Calendar Sync Changes from my TM backups all is well again. I'm syncing with Google calendars, so I suspect that's messing something up. I like the brute force method of emptying the directory daily.
Currently Being ModeratedApr 12, 2013 9:37 AM (in response to Jeff Bailey)
I'm seeing this issue on a MacBook Pro that's only 18 months old. I did a clean install of Mountain Lion, and it's still happening. My calendar syncs to our OS X Calendar Server. It also syncs to iCloud for my iPhone.