Debugger not working in Xcode 6.3.1

Since Xcode 6.3.1 with a Swift project (not Obj-C), if the project folder name contains one or more / slashes, like the date SomeApp04 / 05/15, the debugger is not working correctly for me. It ignores (goes straight ahead) breakpoints without stopping. Remove the slashes in the project folder name and the debugger works correctly.

Has anyone else experienced this lack of debugger functionality?