I resolved the cloudy weather / black screen bugs.
In the "cloudy.xml" file there was a simple line missing at the top inbetween line 1 and 2.
what it looks like:
<?xml version="1.0" encoding="UTF-8"?>
<cycle name="CLOUDS" regions="2">
what it should look like:
<?xml version="1.0" encoding="UTF-8"?>
<timecycle_keyframe_data version="1.000000">
<cycle name="CLOUDS" regions="2">
You can check it yourself by comparing "clouds.xml" with all the other timecyc files. All of them have this line present.
simply copy the missing line in.
cheers