You need to update the Photoshop Script to use the Pro swf, use these directions.  You can upgrade the galleries you have already created by copying the simpleviewer.swf found in the web folder of the simpleviewer pro download to your gallery folder.

The Photoshop script does not use the Pro version of the swf by default you must manually update it.  If you open the index.html of gallery that you are having trouble opening in svBuilder do you see a SimpleViewer logo in the lower right hand corner? If you do then you are still using the Standard swf instead of the Pro swf. I would delete both the simpleviewer.swf in your gallery and plugin folder and re-recopy the simpleviewer.swf found in your pro download file at simpleviewer-pro/web/simpleviewer.swf.