Have VAC to start in off mode when first loaded using a bat file with the command line:
Start P:\"VAC System"\VACSystem.exe IL2_FB_AEP_PF_VAC_v1-0.xml,false
I also use TrackIR with F10/F11/F12 function keys set to Pause-Resume/Center/Precision respectively.
When I load a mission of any kind within the game with TrackIR in the "on mode" (green light), then turn on VAC with Ctrl+NumPad period. All of the above mentioned function keys for TrackIR stop working. TrackIR is working (can look around) but the function keys do not respond. All of the other function keys (Chase View/Fly-by View, External View) also work. Then if I turn off VAC and turn VAC back on the TrackIR function keys for TrackIR start working and work throughout the entire mission.
This happens with all my flight sim games: CFS2, CFS3, Mig Alley and IL2-1946 I've also tried changing the VAC on/off command but the results are the same.
I recently had to reformat my hard drives, reinstall windows and all my programs. Prior to to the reformat I did not have this problem with this same setup. Any suggestions?