I try nDAC demo. I find this SW very useful but when I click to nDAC window, FSX gets paused. Is this how it should work or is there anything wrong?Thanks

Don't know what a nDAC is :->, but there's a checkbox on the Options | Settings | General dialog for "Pause on Task Switch", just clear that and your sim will keep running when switching to other programs.

Thanks Tim. It helped. I didn