Photoshop could not save because of a disk error

Well, quite recently students have been having trouble saving from Photoshop CS5 version 12.0.

It comes up with:
It's strange because if you try multiple times, sometimes it saves and others it comes up with the error.

Could not save as because of a desk error.

Looking in the console log I found these entries:

26/11/2012 16:09:36 /Applications/Adobe Photoshop CS5/Adobe Photoshop CS5.app/Contents/MacOS/Adobe Photoshop CS5[1697] Allocator race detected: transaction is not verified for -103/2 - _mac_bind/Library/Preferences/Adobe/Color/ACEConfigCache2.lst
26/11/2012 16:09:48 /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock[1652] Allocator race detected: transaction is not verified for -103/248 - Untitled-4.psd
26/11/2012 16:09:49 kernel smb_maperr32: no direct map for 32 bit server error (0xc0000279)
26/11/2012 16:09:49 kernel smb_maperr32: no direct map for 32 bit server error (0xc0000279)

It seems to be a problem with users whose home drive is on Windows 2003 or before shares. Luckily I have my home drive on a Windows 2008 share.

Looking on the internet for the kernel error I found this down in the "Mac OS X bug: Empty oflders when browsing Samba shares on Windows 2003 Server". He gets the error when looking in sub-folders on a Windows 2003 server. Might be related.

Tried it with my login with my home drive on Windows Server 2008 share and works without problems.

So far I've tried:

• OS X 10.7.4
• OS X 10.6.6
• OS X 10.6.8
• Photoshop CS5 12.0.4
• Redirecting ~/Library/Application Support/Adobe/ to a local folder

Just had a very similar problem with Windows PC's. Students trying to save from Photoshop to their home drive came up with a similar error:

Could not save as because the file could not be found

It looks like it's a server problem as it happens on both Windows and Mac. I shall update when I find out more.