I was running the AppBuilder simulator from Visual Studio earlier to take a few screenshots.
I wanted to clear my local storage so I renamed the AppData\Local\Telerik\BlackDragon\Cache\WebBrowserPackage-2015.3.1001.1\WebBrowserCache\Local Storage folder to Local StorageOld.
I then ran the simulator and took some more screenshots for iPhone 6 Plus and then iPhone 6.
I changed to iPhone 5 configuration and the Simulator exited and since then I have not been able to run the simulator. I have tried restarting visual studio after deleting the %LocalAppData%/Telerik/BlackDragon folder, but that did not work.
I also tried deleting the %LocalAppData%/Telerik folder and that also has not worked.
The message that I get if I try to launch the simulator for any project is
[2015-10-09 13:28:44.375] Log (Exception,High): System.ComponentModel.Win32Exception (0x80004005): The system cannot find the file specified
at System.Diagnostics.Process.StartWithCreateProcess(ProcessStartInfo startInfo)
at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)