Hi! I can confirm. We have just ported our project from 5.0 to 5.1. We narrowed down when our movable widgets stopped working. It is after porting to 5.1.
I looked into Set Position in Viewport function in C++, and indeed - it has changed a lot from 5.0 to 5.1.
Basically, this function is unusable now. Completely broken.
I have a widget NOT in container. Just created and Add To Viewport called on it. This method works perfectly on UE 5.0 and before. 5.1 clearly broke it.
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