March 22, 2012, 11:17:08 am
Hi Bob, I think the sharp specular highlights on the cars are actually reflected IES lights.
Those reflections ought to be turned off when Light Properties -> Show light source is off, so I'll add this to the bug tracker list - thanks for making us aware of it.
Regarding the sudden wind gust, this is a known issue and they did attempt to fix it in 2.1 Build 4, but it had an unintended side effect (small plants were vibrating) - hence the need to revert to the SpeedTree.dll from 2.1 Build 3 where the sudden wind gusts still appear.
In conclusion, your only option is to lower the Wind Strength slider until this bug has been fixed.