The limits issue is a known bug, and rumor has it that the problem has been resolved in the next release version. It's not caused any problems for me, once I tell D|S it's OK to turn off limits. I'm not sure about the scaling issue, though. D|S and Poser are pretty divergent when it comes to interpretation of a variety of mathematical functions, so it's not surprising that D|S would mangle figures heavily modified in Poser. One solution would be to reset the figures in Poser and resave the scene; import the scene into D|S and apply the transformations there.