HI Pete.
Just a follow up. I thought id let you know what actigate is actually used for, "This modules makes extra variables available to scenery designers, which they can use to make their scenery more interactive." thats extracted fronm the actigate sdk manual, i have replaced the dll, however if i had thought more i could have just turned it off in flight sim using the modules drop down menu !!
From my undrstanding there have been a fair amount of random hanging/interference with other software, from time to time, but nothing too serious, and as you say it dosnt do it on all setup and machines, it never did before on mine, only after the re-install.
Kind Regards
Les