BY JOVE I THINK I FIXED IT!! I had all the same problems as you had and followed a bunch of threads with no luck and a steadily decreasing head of hair – then I found if I loaded up the button bars a few buttons appear just above the multiclip window, the furthest one on the right is a button called ‘MULTICLIP PLAYBACK’ – this was off – when i clicked it on (lit up green) multiclip worked as it should – hurray!
Hope this works for you too
DG