Hi everyone, firstly thank you for the replies and help. I followed advice about a possible texture at fault and I finally found it. firehawk44 suggested I try the CTD which I did and there was mention of a Windows 8 Event logger, so I used that and discovered that there was a problem with the FE.DLL, so after deleting flight plans running I narrowed it down to Japan Air Commuter, which I had recently modified to add an aircraft with the new livery, voila I had it as a 32bit instead of DXT... Changed it over and it's all good!