The project on my timeline has developed and interesting problem and I've no idea how I achieved it. Nor can I figure out how to fix it, although before deleting the clip(s) from the project I thought there might be more understanding out there where you are.

Somehow clips 10 and 87 are the same, and yet they aren't. Last time I opened the project clip 10 was where 87 is supposed to be, as well as where it should be. I replaced it with the correct clip 87 and redid the editing. Clip 10 is correctly placed. Project was saved.

On re-opening, the previous condition is found (10 in place of 87). I find that the real clip 87 is in the media bin and clip 10 isn't, even though it is on the timeline (but properties say "87"). If I reload clip 10 from the harddrive it replaces 87 in the media bin (as 10). If I reload 87, it replaces 10 and 10 disappears from the media bin.

If I open a new project I can load in clips 10 and 87 separately and put them in and out of that timeline. So it appears that while they're still correct on the harddrive, somehow I've got Vegas confused about which is which. Any thoughts on how I did it (so I don't do it again) and how I can repair my error?

Thanks.