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I spend several hours on this but could not solve it: In a map I have a subway train as a LoopMover. It moves from one side of a long and straight tunnel to the other side, rotates there at 180 degrees, moves back and finally rotates back to original position. Until here all works fine. Then I added some Lights, a SpecialEvent and Decoration (LightBox, ScaledSprite) to the train and connected it with Movement->AttachTag. If played locally, everything works as expected. But if played on a server, the mover and the decoration run out of sync - the mover is faster than the connected parts.
Even if all their Actor->Network properties are the same, it does not work.

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On the screen shot below you can see that the front lights of the train are too much in the front. The sync broke seems to happen after the first rotation.
The map MH-AutoRIP(SB) (Rev 2) is playable on [url=unreal://81.169.240.101:7777]Barbies Monsterhunt World[/url] and downloadable here.
Thanks and cheers,
Barbie