Oh wow!  I think you may have just solved my problem!  I know double clicking adds lights.  When I undo that add and try to change using the checkmark I get the blacked out window.  Just using the checkmark from the start seems to let me change the lights no problem.  Thank you!

Bruno: you were absolutely right. Somehow the animation slider at the bottom got moved to Frame 30! I have no idea how that happened since I never even open that "drawer." Thanks to everyone for all the help!

(I went to the cornucopia site and have posted the same message there.) Things are getting weird, though... I unchecked the external morphs, and file compression in Poser preferences. Didn't help. Here's the weird thing... I changed the default pose from a standing pose to a "crazy" pose and tried a couple more poses (saving the files with different names). Vue kept uploading that standing default pose regardless of the pz3 files I would import. (I tried clicking on the pz3 file to make sure the problem wasn't with the file... and it isn't, the correct file would open up). Now things get really weird... I deleted all these test pz3 files from my desktop. Then reset the default pose from being the "crazy" pose back to being the standing pose. Created a new test pose... and saved the pz3. Now things get weird... when I imported it into Vue, it imported the crazy pose (all the files associated with it were deleted). Could it be a cache problem? Again, thanks for any advice/suggestions.