Is there a way to set composer totally back to Default? Or reset Digger?

I'm having some weird issues - one being Digger seems to have went crazy.  Half the time magnify shows nothing no matter how I adjust it. Xray shows totally black lines.  Magnify shows nothing sometimes and sometimes black lines. Something similar happened when I had Anti-aliasing checked in the High Resolution Image Workshop. Once unchecked it was fine. But digger I can't resolve.

Help!

using x-ray

using magnify