Hi, Burning, Wilhelm II returning event was apparently caused by dormant ministers in German scenario file. ( http://forum.paradoxplaza.com/forum/showthread.php?597139-Minister-changes-after-save-reloads ) This ruined my work too, but AC pointed out the problem, so I will arrange scenario files too. Minister events for Soviets and Germany are completed and now I could test them again.
Please don't go with solution number 1, it's a DH vanilla problem. They seem to be fixing it in 1.03 so we won't consider it our problem.