In the new EAP4 that I installed today I came across a "funny" behaviour that I'm not sure if it's a "bug" for not.
After installing EAP4, a new feature is enabled by default: "Use tab for navigation in code".
In C# files, the tab file now navigates around the code. In C++ files, it does nothing!!! It was like the tab key was broken... Since I'm currently doing a lot of C++ atm, it seemed EAP4 broke my tab key until I found the "Use tab for navigation in code" and turned it off.
I would suggest that either this feature is not enabled for code types that it supports or give a warning/error for c++ files so people don't get confused like I did?