HI @wolfer ,
My first guess would be, thaat it has something to do with your Addon (maybe it re-packs the UV Islands when re-Importing, or so).
Perhaps it could also have something to do with the Scale of your Object not being Aplied before Unwrapping.
Anyway, they haven’t actually changed, they’re just Scaled up, so you can simply Scale them down again (with the 2D Cursor as Pivot Point).
