There is a problem I have been running in to when trying to move clips around in the timeline. Usually it's when trying to move multiple video and audio clips at one time. If I use the "W" shortcut to select multiple clips, one of them will have a greyish tint while all the others have a blue tint (selected). When they are highlighted blue, they should be able to move freely. Is there a solution for selecting multiple clips to make sure they are all blue?