After selecting the flightplan, when I push the button "Start RC", the message "Incorrect FSUIPC or no FSUIPC".I upgraded FS2004 to 9.1 and FSUIPC to 3.7.2 (I found the rar still on my disc), so I don

that message is coming back from fsuipc, i'm just displaying it.and you put the new fsuipc into the modules folder?do other apps that need fsuipc work?jd

JD, yes, my FSUIPC is in the /modules folder. Looks like ActiveSky6.5 is not working neither. Although FS runs, it still writes FS is not yet connected...Looks like the FSUIPC problem, do you know where to get v3.7.1, because I did not back it up (shame emoticon)...?

It seems I have found solution. I switched back to v3.7.2, but unregistered, and now everything works well.

I am using 3.74 with no problem (a fully registered version) with FS9.1.Make a safe copy in a different folder of your FSUIPC.dll, .key, and .ini. Then extract from your 3.74 download FS/UIPC.dll overwriting the one in your modules folder.Try starting FS9 up, load a flight, then start RC after loading a matching plan. If you get the error message, the shut FS and RC down. Go to your modules folder and check the properties of FSUIPC.log for the modified date to see if it is current with your test just run. Is so, open fsuipc.log in Notepad or Wordpad and see if there is any clue in there about what is failing.See if anything in this support thread has any bearing. If you wish you could download the interim version from there to try also.http://forums.simflight.com/viewtopic.php?...4db243893160379Note especially the information on certification of signature (not your key but installation verification). Make sure the version intalled correctly and ran.