Squawkbox 2.3 FS9.1 and not able to see other aircraft

I haven't been able to see aircraft flying with me without not using SB or online flight since I patched Flight Sim 2004. I have reinstalled SB 2.3 several times, tried reinstalling the CSL aircraft, etc... to no avail. I have checked my router, tried just plugging directly into my cable modem thinking that it was blocking a port. That wasn't the issue either. Does anyone have any ideas as to what I can try to resolve this issue with not being able to see other aircraft while flying? Everything else seems to work fine. Thanks!Patrick