FileBasedProject.PublishProject() succeeds but Studio indicates publish failed

Question

We are having intermittent problems using the FIleBasedProject creation API. For some of the created projects we are unable to open in Studio. The error information states: 
 "The project with ID {0} can not be opened becasue it was not successfully published to the server" 
 However, the result of the PublishProject() call has a status of PublicationStatus.Published 
 Why are the projects not openable?

Paul · Answer

Unknown said: The point I'm trying to make - and I believe it's the original poster's point too - is that there is no reason why things which worked before (although not officially supported... but without real technical reason to not work if known caveats are carefully treated) should not still work. 
 Perhaps you can make your point without being so antagonistic. You've said before I should not take things personally but it's very difficult sometimes with the comments you make. You either don't have a very good command of English and use words you don't really understand, or you are just deliberately hostile. I am an optimist so I hope it's not the latter and that you'll improve over time. 
 There is a very good reason why things may not work when we move from one version to another. The file-based solution is not designed to handle heavy volumes with concurrent processing. It would have been a workaround at best until we provided a similar solution that could be used directly on GroupShare. Any changes that would impact the performance of project creation in Studio could affect the performance of solutions built around the API. 
 Unknown said: Plus, there is another aspect - statements like "you should use new API" are not easily done, especially in production. 
 Really!!

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FileBasedProject.PublishProject() succeeds but Studio indicates publish failed