FSNav 3.0

I have been using freeware FSNav 3.0 and patch for Fs2002. Its been working fine for months. But lately when I try to open it up, all it does is flicker in background. I have always hit f9 then ctrl f9 and had no problems.
Any ideas? And please dont tell me to go and get the payware version. ( that is the obvious answer), but 3.0 has worked in the past, so I would like to solve this problem.
Thanks All.
Dave
Any ideas? And please dont tell me to go and get the payware version. ( that is the obvious answer), but 3.0 has worked in the past, so I would like to solve this problem.
Thanks All.
Dave