Yes, that's what I do.
Highlight it (blue background) BUT when I drag it, it does not move that simply - it moves quite a few rows down.
Meaning that the move does NOT take place right there by the highlighted clip but further down (about 7 clips down) - which also means I cannot move any clip to the very top of the list.
You can imagine how hard it is to deal with any kind of order - like some strange puzzle... (how do end up with clips on top that I want, instead of just affecting the clips below).
I simulated that look with the black line that does appear where the clip will be moved to (the shortest distance, down [only]). Forget about being able to move that clip upward... From that middle row, one can only go down.
FYI Retina MBPro - I would not be surprised that this may be the culprit, but it is just a guess...