[OSG] Dark dots in the sky at 7 pm

At 7 pm, the sky gets dark dots. They go away at other times, but I once saw it in the morning as well. http://i.imgur.com/DJlAkBT.jpg

Latest OSG nightly win 8.1 64 bit.

(RM-2712 from redmine: created on 2015-06-19 by Lars Söderberg, , closed on 2015-06-19 by nobody, duplicates #2693 (closed))