IMHO Electroglyph has hit the mail on the head, many modellers forget to reset the xForms at the end of modelling, the problem then is that on import to another package the model just says this part of the object is x units from that part, however Bryce units are different to poser units and different to Max units, so all the object appear in different spaces. If the application trying to import doesn't support the units as defined they may hang (for example too many decimal places in the unit).

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.