Loops Fine In Sonar, but not Ok In Ableton?

Hi All, First time post, so pardon me if this is in the wrong forum. This post is related to using Sonar output with another product. I hope it is ok to mention this other product? I have some tracks in Sonar 4 (an older version, but still works fine). I have created two marker points that define a loop. When I play the loop in Sonar, everything sounds fine. So I export the audio from the in point to the out point as a 24 bit stereo wave file. Now I pull up Ableton 7 and switch to arrangement mode. I want to use the loop to make an arrangement. I drop the Sonar loop into Ableton and defaults to Warp mode on and has detected a tempo in the loop and set the tempo to match that loop for a 1:1 playback ratio. When I play the loop in Ableton it does not loop correctly. It cuts off some of the end. I am wondering is this a known issue between these two apps? Is there something I can do in Sonar to make the loop more compatible with Ableton? Thanks for you time, DS