(In case you haven't solved this yet)
You could try running
peverify and see what it has to say about the file. Also, try doing a full rebuild of all the projects.
If peverify thinkgs that the file is OK, I would recommend logging a bug on:
http://lab.msdn.microsoft.com/productfeedback/to let the VB compiler team take a look at this.
Best regards,
Johan Stenberg