There are some sequences where I can open the EDL Manager in Avid, and click Open, find the bin I want, find the sequence and it makes an EDL. There have been a few sequences where it says "File is not valid and cannot be read." I have yet to find out what the problem is. I have tried different settings and still nothing. Is there any EDL problem solving? I have tried the sequence is a different bin, with different timecode and still will not create an EDL.
I make EDLs this way as well. You've probably done all this, but just in case. Do a hard shut down and start up. I'd make sure your sequence starts at 01;00;00;00. I'd have all the tracks selected with in and out points on the seq. I'd try cutting the timeline into a new timeline as well as a new Bin with a simple name. Have nothing else in that Bin. Render. Save. Close out of Avid entirely. Then Open Bin. You could even try create a new project with a new Bin in there and move the seq into there and open it that way. Sorry if you already tried all this! You never know.