User's work-files are hosted on a Windows Server 2003 SP2 volume accessed via SMB. She's been opening and saving the files from the server successfully in Dreamweaver for years from other Macs running Dreamweaver CS4.

Now she has an iMac running 10.7.4 and Dreamweaver CS6... and it's not the SMB problem you'd expect.

She mounts the server volume. She opens and saves files normally with full r/w permissions from any app... except Dreamweaver. For any file that she attempts to open in Dreamweaver -- whether from the Finder or from within Dreamweaver -- Dreamweaver pops up an alert reporting that the file at the file-path was not found. The same file is easily accessible from other apps and from the Finder. She continues to have full read/write access to the shared volume.

Local copies of the files do not have the problem. It only affects files hosted on the server and it only happens in Dreamweaver.

So, I create a new user account and everything works fine... The user mounts the sharepoint, opens a file with Dreamweaver... perfectly normal. Then she quits Dreamweaver and relaunches it... everything's fine. Repeatedly. It all works normally. She quits Dreamweaver and unmounts the share, then she mounts the share again and tries to open a file in Dreamweaver again... and it reports that the file was not found.

This is reproducible: If the server volume has been mounted and unmounted repeatedly under any user account, that triggers the error which continues occurring under that user account from that point on. A restart will not fix it. A safe-boot will not fix it. (In fact, restarting seems to trigger the problem by unmounting the volume.)

I tried trashing the entire contents of the ~/Library folder in one of the test-user accounts. It doesn't fix the problem. Once it strikes a user account, the only temporary fix seems to be using a new user account. And that's like a ticking time bomb just waiting for the problem to pop up again.

Any ideas?

TIA!!