I just tried this in 2.2.3 and can't get it to happen. It works ok in that version.
What I did notice is if I drag the file quickly and the pointer leaves the RB window (for example RB and iTunes opened side by side and cursor moves to iTunes window) when I move back on to RB the file I'm dragging has been released and I need to let go of the trackpad and click on it again.
Not a big issue but annoying all the same :)
Any way I think your issue has been fixed in 2.2.3.
I find this version stable and safe to upgrade to ;)