I actually have this problem right now. I can't for the life of me change the layout back to having the available clips on the top and the current edits on the bottom. It's so frustrating. 'Swap project and event' is greyed out and every time I hit 'Revert to original layout', I am just presented with the available clips on the bottom on the current project on the top. Does anyone have a solution for this issue? Thanks!