In VS2010, when I tell a project to be signed with a key file, but DON'T check the "Protect my key file with a password" box (so a .snk file is generated), I can't step into any code in that assembly when debugging. If I provide a password (so a .pfx file is generated), however, I can. I am not delay signing the assembly. Is there any reason I can't step into the code when I don't protect the key file with a password?
Also, I'm using a project reference within the same solution, not a dll reference (so I'm not just missing my symbols file or anything). I have cleaned and rebuilt both solutions many times.