Sorry, this may be a repeat, but it doesn't look like my post went through.
I'm still working with using PP.  My old Canon scans were not making PP happy, very underexposed, some clipping, and many x's on just the IT8 target, never got any further than that.  So today I bought Vue Scan.  I followed the Vue Scan directions in the PP guide, and again got underexposed, with even more x's.  I'm sure these problems are most likely me, but I'm pretty lost now. 

Any suggestions would be so very much appreciated.

Betty