drag and drop order in mastersection

Last week I had a harddisk crash (yess ssd disks can crash) and so I had to make a fresh install, including wavelab.
Today I found out that I can not use the drag and drop function in the mastersection with the order of the plugins.
It should work, it has always worked, but after reinstall it doesn’t. :blush:
Am I missing something here? Is there a hidden setting?