I came across an issue where the PSI impersonation was not working. I found an interesting Script tool that helped to check the authenticated user. This tool can help in several scenarios where authentication is a problem. Currently the diagnosis page provides details regarding the following...

I came on my test environment across this problem when trying to install the latest update I've got the error message: "The expected version of the product was not found on the system" this can occur on Project 2007 and 2010. Running the following command from the command prompt will do the trick...