Hi All,
I believe that this bug exists in MC 16 as well.
If an update is available and launched within MC from the task area, if the current user is set up as a standard User (which, for ALL tidy set-ups this should be true - of course it often isn't), then the user will be presented with the UAC prompt to supply an administrator password. After the password is supplied correctly, the install will proceed as expected, but as the install finished, the user will be presented with the following Error dialogue:
Update
Thee was a problem installing the update.
Please retry the update and ensure that it UAC permission when prompted.
Retry Update Cancel Update
If the user presses retry, the update will be reapplied, but at the end the same prompt will be see - ad nauseum
However, if the user presses cancel they will find that MC starts yet the update HAS been applied successfully (as reported in the Help-->About box).
I can confirm that this problem exist on Windows 7 (32 and 64 bit) and I believe a similar issue is seen on my Windows 2003 server.
Chris