I am using Xcode 6 (GM, I didn\'t download betas), and I am developing apps for iOS 7+. For all my projects, I just opened the same projects I used to work on in Xcode 5.
As stated in the comments, you should turn off catching the C++ exceptions by editing your All Exceptions breakpoint.
In order to do that, right click on your breakpoint and change Exception from All to Objective-C:

Exceptions in C++ code are part of normal app functionality. However, exception breakpoint is not catching unhandled but every raised exceptions, even when they're handled correctly later on, hence the stop in execution.