We are having the following problem:
We have four work stations all with the same issue. This does not happen all of the time, but seems to occur on some workstations more than others.
The File Server:
I have reset all to the Permissions/ACL's on the server
At least one of the Workstations has had a strange habit. Sometimes after a crash, InDesign will open a huge number of files. Files going back over a month. There seems to be a cache of file references that it reopens, even though the file had not been touched in a long time, and had in fact not been open just prior to the crash.
I am not exactly sure how idlk files are suppose to work; however, I have observed tht idlk files don't always seem to be created, and sometimes disable while a file is being worked on, just prior to these saving problems occur.
Sounds like one of the workstations has the OSX.7 + checkbox to restore previous windows on restart still checked. Also working over a network is problematic with Adobe software. It may work but in not reliable as you are finding out. The lack of proper lock files is a symtom of this.