Problem Switching Windowed/Full Screen

Has anybody else found they sometimes get a problem switching FSX from full screen to windowed when using ASX? When I'm full screen I can go to windowed but when I try going back the screen freezes. If I try ALT ENT then all I see is a black screen and I have to restart FSX. Another thing I've found is that sometimes, when I start a flight, instead of a black screen with the loading bar showing I see the loading bar but I can see my desktop behind. When loading gets to 100% I then need to restart FSX to the beginning. Of course, this may have nothing to do with ASX. It just so happended that it seemed to start when ASX was installed but it doesn't happen every time. I was just wondering if anybody else had seen this problem. If not then I will investigate further.