I remember something about the obj exporter losing focus.

Try clicking on the Start menu bar and then on Poser again to regain focus. I vaguely remember someone reporting that the option boxes were now selectable again. Doesn't make any sense of course but it's worth a try :) 

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.