Hi Pilou,

> No need video : all functions are freezed : impossible to click on button Cancel etc...
> So some ennoyous! :)

Does it only happen when you're dragging a particular thing? Maybe it's related to history recalculation if you have a long chain of things to update. What happens if you select all your objects and turn off history updating by using Edit > History > "Disable update" button, any freezing after that or not?

- Michael