This just started on the flight I'm currently flying - never noticed it before that I can recall. When I switch to spot plane view, some sections of the city lights below me are flashing/blinking on and off. They get brighter than they should be (brighter than the other "normal" brightness city lights around them, and then disappear completely. It's been happening the entire flight now (more than an hour). Any ideas?

Are you sure this isn't from Ultimate Terrain. SOunds to me that it is like what happens sometimes with UT's night lights. I thought GE Pro was just ground textures?

no I'm not sure - I have both. GE Pro does night lighting as well so I'm not sure which add on is actually the culprit.I noticed something else, the only lights that are flashing are those that are "behind" the clouds. There was a scattered/broken cloud layer below me, and the area of lights that were being affected were only those that were partially obscured by clouds.

This is an acknowledged GE Pro situation I believe - the lights are in groups to minimise the effect on frame rates, it's a bit like cheap Xmas tree lights, when one goes out, the whole group go out.Apparently modelling each light individually would kill your frame rates stone dead.I believe this is right - please anyone correct me if I'm wrong.

This happens to me too -- I'm running GE Pro and UT. I was wondering if there was a fix, but since it doesn't happen all that often and apparently only under certain circumstances, it never bothered me enough to spend a lot of time researching it.