CorelDRAW X7 freezing in trace

When trying to trace a bitmap, I can only trace using the "quick trace" option.  When selecting another trace option from the drop down menu, Corel freezes before the power trace window opens up.  I have tried a variety of bitmaps from several sources: my own creations, commercial clip art (jpeg), logos offered by Corel in tutorials on how to use power trace.  They all cause the same problem.  Quick trace is not always the best option and I would like to have a fully operational design program back!  

I am a long time user of Corel and have successfully used trace many times.  I don't know why it suddenly decided to stop working but it is very frustrating.  Any help would be greatly appreciated.

Thank you!

Jules