I too have many issues using RM on my Mac. For example, move a rig from, say, slot 8 to slot 3, I'll end up with two slot 3's in RM and can't use the Remote to switch between slots. Other times I'll create a new performance, save it, then it disappears. The biggest issue is trying to edit performances. Saving it in both my Profiler and my local library, do some edits in the local library, the edits carry over to my Profiler, NOT what I wanted (I wanted to try some different things with a performance, but didn't want the edits to change the original saved in the Profiler). In general, editing a performance is somewhat hit or miss as to whether the edits stick.
Now I use RM to create a new performance, but am VERY careful not to mess with it once created. It's workable, but not real great. I'd love a new, updated RM that actually works for performances!