I don't know when this started, but I discovered that Visual Studio 2013 Update 5 aborts when attempting to open properties for a project within a solution. It seems to only happen when we have more than one project in the solution.
I've been able to reproduce it in two circumstances:
In every case I've tried where there's a one-to-one solution and project, it's working fine. A colleague who's working with VS 2013 Update 4 verified that the crash occurs for him as well.
We don't know when this started, but historically, we've opened these property sheets many, many times. However, it's probably been a few months since I've worked on a mixed-language process, and same with my colleague.
I've turned on logging and there was a complaint in the log about two versions of the Desktop SDK having the same internal ID. I removed one of those altogether, but that didn't seem to affect anything. It's also not clear if that error has any relationship to the crash.
I've also done a repair on Visual Studio, and that did not correct the problem.
I've also tried deleting the .suo and .user files. Again, no luck.
I've done quite a bit of googling but haven't found anything that matches this specific problem.