No SimConnect after restart of FSX

I have been using SimConnect to communicate with GMap and Super Traffic Board v2.3 on a client machine without any problems.Suddenly, however, I now have a problem. If I close FSX, and then restart it, the applications on my client machine no longer are able to communicate with FSX. The plane in GMap stays in its default location and STB sees no traffic. My research indicates that this may mean that my SimConnect ports are locked / blocked and this doesn't allow the applications noted above to reconnect to FSX once FSX has restarted. I can, however, reboot the FSX machine (and not the client machine) and these applications connect right back up.I have no idea why it does this or what causes these ports to remain shut down when FSX is restarted, if this is indeed the cause of the problem. All I know is that a reboot of the FSX machine corrects the problem. Does anyone have suggestions on how I might address this problem without having to reboot the FSX machine? I never had this problem before whenever I used these apps. As best I can tell, this problem started out of the blue. The only significant change to my machine that I can recall has been to install updated video drivers. I'm running Win 7 Ultimate and FSX Acceleration.I restart FSX a lot, and it is a real pain to have to reboot the machine every time I do so.Thanks for any assistance you can provide.Robert