I run 4128 on my Macbook with 10.4.10 and one WinXP VM (no Bootcamp). On this computer I have 2 users, "Meins" and "Artur". The VM had first been created under user "Meins". I have moved the .pvs and .hdd file to /Users/Shared/Parallels/WinXP. Under user "Meins" everything runs fine. Under user "Artur" I get always the error message.: "Parallels Desktop is unable to access the virtual hard disk image file /Users/Shared/Parallels/WinXP/WinXP.hdd. The file is missing, corrupted, or used by other application." This appears independent from the access rights for the VM files. At least I have tried every change which I could think of. Now under user "Artur" I have used the Parallels function Clone. This worked fine, the cloning could access the original VM files, and as a result I have copies of the .pvs- and .hdd files under /Users/Shared/Parallels/Clone of WinXP. Under user "Artur" I can now run the VM "Clone of WinXP" without problems, but get the above error message when trying to run the VM "WinXP". Under user "Meins" it is exactly the other way around. What's the problem, and how to remedy it? Thanks for any support.