title: App won't launch on device or simulator
body: <p>So... this is beyond strange.</p>
  
  <p>I had an app that was running perfectly fine in simulator and on device. I've actually already submitted the app and it is for sale in the App Store.</p>
  
  <p>Today I went back in and made a few changes for an update.
  The app now will not load on my device and it won't load in the simulator.</p>
  
  <p>In the simulator it says "Attaching to app_name" (it lists the actual app name) and it stays on this process of "Attaching" indefinitely, while the Simulator screen is entirely black.</p>
  
  <p>When running the app on the device it says "Build Succeeded", then "Finished running app_name" without anything ever showing up on the device.</p>
  
  <p>I restarted XCode and tried restarting my computer, but still no luck...
  Other apps do work, but not this one.</p>
  
  <p>Any ideas?</p>
  
  <p>EDIT: I just started a brand new project, copied over all the assets and code, tried running and STILL the same thing happened. I thought for sure creating the project anew would work...</p>
  
  <p>FINAL EDIT: After running "Clean", deleting the DerivedData folder, and restarting my computer a SECOND time, the new project (with all assets copied over) is now working. The original project still does not work. So I am not sure what caused the issue and what fixed the issue, but for me at least I can now move on. What do I do with this thread? Can it just be deleted? Thanks everyone who chimed in to try and help!</p>