Created attachment 290460 [details] [Animated GIF] Bug I'm not sure what are the exact steps to reproduce the problem. Clicking Resume, Step Into, Step Out, Step Over buttons doesn't do anything. Console error: [Error] DebuggerManager.resume failed: Error: Can only perform operation while paused. _dispatchResponseToPromise — InspectorBackend.js:321 _dispatchResponse — InspectorBackend.js:283 dispatch — InspectorBackend.js:157 dispatchNextQueuedMessageFromBackend — MessageDispatcher.js:42 (anonymous function) (DebuggerManager.js:197) promiseReactionJob
<rdar://problem/29055612>
I'm not sure what I can do to investigate this.
This happened only once two months ago, so it most likely has been fixed already.