Thanks for the fix, Arne, but I’m afraid the problem is not completely gone yet…
This fix works if you click the right mouse button while the pointer is still inside the CViewContainer of the knob, but when moving the cursor, if you end up into another CViewContainer or outside the VSTGUI window (it can happen if you have controls on a footer or a header, like in my case), the editing gets stuck again.
Good thing is that this time if you click again the right or left mouse button while inside the knob CViewContainer, the editing stops, so there is no need to close the GUI.
Way better than before, but not perfect yet 