I have something very strange on Windows 8.1 with TidHTTPServer (Tokyo 10.2.3)

sometime the server wan't start with error 10048 (WSAEADDRINUSE) but with netstat or Sysinternals TCPView I can't see any binding on port 80 ?!

the only solution I've found is to restart my computer :(

I guess it has something to do with program reset (F2) but I'm not sure.
Shared publicly