Just to clarify,
You can have CR 2011 which is version 14.0 and CR for VS on the same PC. Because there are some version 14.0 assemblies in CR for VS which is version 13.
The problem arises in that you cannot have CR 2011 and CR 2013 on the same PC because they are the same product just reversioned from 14.0 to 14.1.
So those 4 or so version 14.0 dll's that CR for VS uses when updated to 14.1 can and likely will cause issues.
Just an FYI, R&D does have plans to put these component back into sync with each other but for now I suggest no installing CR 2013 on the same PC or installing BI 4.1 .NET SDK on the same PC and CR for VS.
Don