There is a little, yet annoying bug in the latest Pro Version:
When I unlink a movie clip from its audio track, then change the length of one of the two and want to link them back together, the selection with keeping CTRL pressed and clicking on the clips doesn't select them both. It's the same as if I click on one of the clips without keeping CTRL pressed. One of them gets deselected. I always have to grab the whole thing by holding the left mouse button pressed and 'catching' both clips in the rectangle.