George Tsiokos’ blog

Microsoft:

When a ClickOnce application is updating on startup, please display a wait cursor, or some indication to the user that the application is loading - the progress bar currently disappears after the new version is downloaded. On older computers, the time between the progress bar dissapearing and the application loading can take 30-50 seconds…

When attempting to install a ClickOnce application when using mandatory user profiles, you may receive an error message similar to the following:

• The manifest may not be valid or the file could not be opened
• Manifest XML signature is not valid
• The profile for the user is a temporary profile

Please rate and validate this problem at the MSDN Microsoft Product Feedback Center so Microsoft responds with a solution or workaround.