This is normally a video card driver thing. Two things to try (which I thought were covered in the ActiveSky documentation?):
1. In FS use Options-Settings-Display-Hardware and change the "render to texture" option -- normally switch it off.
2. In FS use Options-Settings-Display-Weather and make sure the 3-D cloud percentage is at max -- i.e. 100%
I'd recommend the latter anyway, to stop those horrible false clouds flickering.
FS uses facilities to "morph" from one weather state to another. There can actually be flickers even so, but they are rarer. Unfortunately Microsoft publish no information whatsoever about how to get into the weather and all my thousands of hours of hacking into the code failed to find any way to operate the morphing for external programs.
Regards,
Pete
Pete,
Thanks for your prompt reply.
I already had render to texture set and 3D clouds at 100%. I have already tried different video drivers to no avail. It seems the situation must just be affecting me, but if you can think of anything else which may be causing it, I'd be glad to hear from you.
Cheers
KeithB