which version are you using (in help/ about) ?
also it would be useful if you were able to send me a link to a zip of one of the files that had this problem
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It happened to me on two versions: the first one I downloaded about a month ago and the one I'm currently using, which is 3.1.6466. Unfortunately, I don't remember any of the specific tracks it happened with, but I still haven't had an issue since I unchecked the "remove silence" option.
EDIT: I've started using the .mp4 format over the last year or so, and I'm pretty sure that's what it was freezing on. I noticed in a similar thread that there may be a fix for that, so I'll check for that .dll file in the FAQ section.