Since I've downloaded the new Xcode 7 (today), my assistant editor also doesn't work. I tried to create a new playground file and only write,
print("Hello")
but still doesn't show anything.
In the Debug area there is an error saying:
Sep 20 21:43:16 While loop[1205] <Error>: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Sep 20 21:43:16 While loop[1205] <Error>: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
Sep 20 21:43:16 While loop[1205] <Error>: CGContextRestoreGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.