Its funny you should bring this one up. I have had this same problem off-and-on for some time now. Its got to the stage where I almost take it for granted.....sort of expecting it not to go through first time.

The other strange thing is that if I am converting several tracks, its only the first one that seem to have the most problems. I've put this down to one of those 'querks' that happens from time to time with RB...........doesn't exactly stop you doing what you want, just doesn't do it as you expect.