I started in one multi-monitor scheme, moved to a different monitor arrangement, and lost some of my menus. I solved this problem by switching to single-monitor, which brought the menus back. I wiggled them a little, switched back to multi-monitor, and voila! they stayed in the last place I moved them.
I'm a (recently) former ArchiCAD user. AC had a phenomenal feature where multiple menu layouts could be saved into profiles. Basically an interface profile manager. It was a supremely handy feature: I was forever going between multi-screen work, single-screen work, and client presentations on a projector, and having these layouts stored saved me a ton of time. Also helpful when I needed different sets of tools/windows for different stages of a project.
Is this the correct forum for suggesting new features? 😃