I am not using any other add-ons in FSX on Windows 8 other than the Captain Sim 707-300/300C/E-3/VC137, 737-100/200/200ADV/200C/200F, 757-200/300/200F, 767-200/300/300F/Tanker/AWACS, 777-200ER/200LR, B-52, C-130 X-perience, Space Shuttle, Weather Radar, Weapon for FSX.
In other words ALL CS FSX add-ons, plus FSUIPC4 v4.8.5.9. No other FSX add-on's at all.

I am encountering some interesting problems in the CS767 (currently doing a flight) and CS727, but I will list them in their forums, not here.