Studio .Net Error after 5.0 upgrade

[larbs]

Hey, I just upgraded to 5.0.
My builds that have been running daily without issue under 4.6 no longer run.
They error out with .....

Error converting web project URI for project 'http://localhost/Web.vbproj': Exception from HRESULT: 0x80005006.

on the visual studio build.

This is now happening on the project that was working fine before and relates to a different solution than the one I discussed with Kinook previously.

Originally I was guessing that it was a IIS metabase quirk on my buld machine, but now since the solution that built yesterday under 4.6b now fails under 5.0, I am more coerned. Anyone lese seen this?