filesystemmacos
An application I was using had a .dockset file stored in my home directory. I moved this file, and the application automatically updated the location of the file. I notice a similar effect when moving files that I'm currently editing in apps like Xcode, TextEdit, BBEdit, Preview, iWork, etc.
How does Mac OS keep track of these file movements?
I had the same problem. I tried what Matt Love has suggested and still had the problems. I then downloaded Cocktail and ran permission repair, rebooted and all worked again.
Autosave is not working, you might not have sufficient permission on that volume. You should try rebuild the permissions or take the folder ownership using chown -R.
"… does not support permanent storage" means Versions is not working because the volume is not HFS+, it must be NTFS or FAT and you are using a protocol such as smb.
Apps who aren't using Version and Autosave have no problems. If you want to disable these look here.
Best Answer
From a higher point of view (in opposite to the low level implementation) this is probably related to NSURL's bookmark capabilities.