Ok, weird, I thought it'd work since I can usually import OMFs fine (from Logic most often).
That's a real shame. Guess I'll have to stick to bouncing for now and hope they fix it in an update.

I import from logic just fine, but I have given up on export for now.  As Mark said, we kept getting same error again and again.

I export OMF's all the time and never have any issues.  I think an earlier poster suggested the 2 gig limit and I think you should investigate that more.  20 stereo tracks can add up to alot of realestate.  One thing I do before exporting an OMF is to "Remove Silence" from all the tracks.  That reduces the size of my OMF.  I use my own "remove silence" settings  (-81 DB) because I usually have very quiet fades in and out.
 
Try cutting the project in 1/2 and see if you still get the error.
 
My settings (things checked) are as follows:
 
OMF version 2
Embed audio within OMF
Split Stereo Tracks Into Mono
Include Archived Tracks
Write RIFF Wave
 
 
These setting work for me to have a Sonar OMF/project imported into Protools.  I've done this on a regular basis for years. 
 
 
 
 
 

2gb thing goes without saying 

Still doesnt work this end, even on a 5mb project (test project)

Jimbo..perhaps you can try the same test project we attempted and see if your results are better?

I'll try making the project smaller, but it's not 20 stereo tracks, only two are stereo and the rest is mono, and a lot of them are partials (like backings during a chorus or bridge). The total project size is 430MB.

I'm pretty sure this is the track Mark and I attempted to export as OMF: http://www.cakewalk.com/support/dl.aspx?DLID=1909

Also, the thread we are referring too.  We did notice few things that may be helpful: http://forum.cakewalk.com...rt-issue-m2964722.aspx

I'm dloading right now....I'll report back

And just for the record,  I export OMFs at 16 bit 48K.  Not sure if that makes a difference.