Hello! I often (3x / day) I get an error message "Invalid window handle Code: 1400".  Log: MyApp.exe: 00001C10: 10:21:54 [83.43.248.14]:EOSError : System error.  Code: 1400. Invalid window handle : Addr: $00432FE4 Only way to solve this is restart the service. Can anyone give me a hint, where do I have to search for in my code? What could be the reason for that? Thanks in advance Mike