I'm working in Logic 8 on an Imac OSX 10.5.8 with 2.66 GHz Intel Core 2 Duo and memory: 4 GB 800 MHz DDR2 SDRAM. I've had no trouble before, but now I'm breaking down a solo piano concert recording. Trouble starts when I cannot move a region--that I've just separated with a scissors cut--down to the next available track. I'm saving after each step. So I shut down the computer. When I come back, I can move the track. But then after awhile, when I want to make an edit on one track, the edit also shows up on the track above. I try moving the track I'm working on to one track down. That works once. But then on another, it won't move. Then I find most of the tracks I've already worked on and left as whole regions now have apparent edits in them. Ideas?