VS 2015 Update 1 - Claiming I am debugging a release build

Question

After updating to VS 2015 update 1, if I run a web project (MVC), stop the application, then try to run it again, VS stops and pops up a dialog claiming

Answer 1

In my case, the error message was correct. I was running an application that loaded the released version. So I corrected it by having the application load the debug version instead.

Elementary, I know, and I realize I make myself look like an idiot. But sometimes the problem is exactly what is reported.

Answer 2

There seem to be as many solutions as there are people having the problem, but in my case I had to remove and re-add a project reference. The project reference was in a unit test project in the same solution.

Answer 3

I encountered the same problem. I resolved the problem by manually deleting all the files from the 'bin' folder and then rebuild the solution. I don't get this dialog anymore.

Answer 4

I solved the problem setting the configuration to Debug in the Configuration Manger window as suggested in this answer.

Answer 5

Restart Visual Studio. This fixed the issue for me in 2017 Professional.

Answer 6

Cleaning (and rebuilding) the solution works for me as a temporary workaround. Also you can select Debug > Options and unselect the Suppress JIT optimization checkbox.