We're sorry to hear about the problems you've been having with Montage. Your report of missing data both concerns and surprises me. We went into beta on Montage 1.5 on April 4, and made a late beta available to the general public before we released. During that time, Montage releases were in the hands of many users, and we received no reports of this behavior you decribe (all bug reports come directly into my In Box). I've done a quick review of all of our tech support inquiries and our on-line forum, as well, and haven't been able to find any other similar reports of data loss either. It seems that your problem is an uncommon one (although that probably doesn't feel like much consolation to you).
I'd be happy to troubleshoot this issue and help find a resolution to the problem, but the MacUpdate forum is probably not the best place for troubleshooting support issues. Could you email me directly so we can start a dialog on this? You should have my email address as I was the one who replied directly to you based on your original comments.
Mariner Software Quality Assurance
(Version 1.5)