FSX crashes just after landing

Hey guys, bit of a random one. I have been running FSX on Windows 8.1 fine but the other day i installed FTX England which looks really good but ever since then i have been experiencing random crashes pretty much straight after landing. Just wondered if anyone else had experienced anything similar? I also installed Leeds Bradford extreme from UK2000 on the same day but i disabled that and its still crashing so i'm guessing it has to be FTX. I am also running with DX10 preview as i cant get FSX to run in DX9 with any of my add-on aircraft.

In case it helps i run the following add-ons when i'm in FSX:

GSX

PMDG 737

Aivlasoft EFB

SmartCARS

Active Sky next

REX 4

Aerosoft's Dublin Airport

Leeds Bradford Extreme UK2000

FSUIPC (Registered)

My system is as follows:

Operating System: Windows 8.1 64-bit

Processor: Intel® Core i7-4770 CPU @ 3.40GHz overclocked to 3.9GHz