visual studio 2010 - The Operation could not be completed: Invalid Pointer

Question

Update:

Below you will find answers that are mostly connected to ASP.NET issues and not the question I originally had. If you have any issues regarding ASP.NET scroll down and ignore the Answer that is marked as solution, as I had some extremely rare case that I haven't encountered again so far.

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Original Question:
for a few days i have a problem with my visual studio here. everytime i want to open an Android landscape layout (default layouts load normally) it tells me "The Operation could not be completed: üngültiger Zeiger" (Invalid Pointer) (english studio on a german Win 7) i've found some threads in different forums, but most were related to a font change, what i never did. my font is Consolas right now

another thing i found was this one: Link
but i never found those lines in my .csproj files

so... what is wrong here?

question from:https://stackoverflow.com/questions/14252927/the-operation-could-not-be-completed-invalid-pointer

Answer 1

I had a similar issue, and for some strange reason, renaming the solution file (.sln) to something else resolved the issue.

I haven't figured out why though.

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Edit: Please have a look at the other answers before trying this one out since there might be one that suits your problem more specifically. The answer above solved an issue that was caused by something that normally doesn't happen, and can't really be reproduced, whereas the answers below are caused by something specific.