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and yes, the project was pretty much all edited in vegas
Unfortunately, I don't have an answer for you and a quick Google search turned up lots of posts about FCP blowing up on EDL import with no resolution, but before you drive yourself crazy getting this to work, I thought I would point a few things out. The EDL Export in Vegas only supports the first Video track and Audio track. So if your Vegas project has more than one video and audio track this isn't going give you what you expect. Also it only supports cuts and cross fades (dissolves). No FX or transitions of any kind will be exported so any color correcting or other processing will be lost.
I just wanted to be sure you knew this so that you don't spend a lot of time getting it to work only to find that is not what you expected. Good luck.
~jr
http://www.johnrofrano.com/