Execution permission cannot be acquired

Det lyder som om ASPNET-kontoen har fået fjernet sine rettigheder til dit sourceområde eller noget i den stil.

Hmm, jeg har løst det nu:

http://blogs.msdn.com/shawnfa/archive/2004/10/18/244074.aspx
Se nederst i den oprindelige tråd:

"All you need to do is delete the security policy from your disk.  As an Administrator delete %WINDIR%\Microsoft.NET\Framework\<version directory>\config\Security.config and Security.config.cch.  This will remove the machine level policy.  Then, run caspol -all -reset in order to put back the default policy .... otherwise you'll be in a state where you grant FullTrust to all code (assuming you have no code groups on other policy levels)."

Derefter bootede jeg maskinen, og det ser ud til at den fungerer normalt igen.