"SOLVED"
Hi!
I didn't have that trouble in the past. In "Mouse Modifier"/ "Project Marker/region lane" Even if I select "No action" it still act as Hand Scroll is ON.
(only the mouse cursor icon change)
Because of this bug, I can't move Regions without messing things up.
Exemple :
https://i.imgur.com/8MNMymR.gifv
It doesn't do that for "Midi Marker/Region lanes". The bug is only with "Project Marker/region lane"
A bit of hardware info :
Win 10
Intel i7 3770k
Nvidia GTX 1060
12 GB RAM DDR3
SSD 250 GB
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SOLVED Update : It was the "Zoom preference" in SWS EXTENSION that somehow got activated by a script extension.