I think I was fustrated by something like this before. I know that trying to change the origin of a grouped object can sometimes yeild screwy results. It's one of those Bryce bugs (at least that I know of with version 4.)
Provided that what you're trying to multireplicate is a single object, then it could be something as simple as clicking the little lock closed before you hit the check mark. For some reason, I've found Bryce is also funny if you assume that it likes your settings without locking it. Dunno why that is, but that's from my experience.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.