dlk - try setting the selected resolution down a notch to 16 to see if that helps with the export.

Remember, for exporting converted boolean groups, you do not need to use the Easter Egg export. Instead, use File > Export Object from the menu.

And, as Veritas found out, Bryce lights cannot be exported and will prevent the conversion from happening properly, if at all.

So, make sure your final object has no Bryce lights, trees, metaballs, infinite planes, or neutral objects/groups.