Dark shadows after upgrading Lightroom Catalog

i successful in transferring lightroom files old computer new one.  appreciate helpful advice received adobe community.  after successful transfer, have issue puzzling , frustrating.  background:  using same monitor new computer , calibrate monitor regularly.  have not changed settings on monitor.  have photoshop cs5 on both old , new computer.  had lightroom 4.0 on old computer , upgraded lightroom 6.0 on new computer.  here problem.  when lightroom upgraded catalog, noticed images, color pretty accurate.  highlights , midtones looked quite good.  shadow areas inky black.  zone iii zone 0  got crunched no gradation.  my  knowledge, variable changed in transferring photos lightroom upgraded catalog 4.0 6.0.  thought @ first color spaces might issue.  lightroom 4.0 , 6.0 both set prophoto rbg.  "old" photoshop cs5 set prophoto rbg, "new" photoshop cs5 set srbg @ time transferred photos.  changing color space in cs5 after transferred photos made no changes in images.  questions are:

 

1.  experienced inky shadows normal in upgrading lightroom 4.0 6.0?  did adobe somewhere along way decide change black saturation point in lightroom or that?

 

2. if inky shadows not normal when upgrading catalog, did wrong in transfer process , how can fix it?

 

3.  if inky shadows inevitable in upgrading catalog lightroom 4.0 6.0, if started over, there reasonably photos compensate going happen when upgrade catalog?  ask because, can correct shadows in digital files in raw format.  can tell images scanned slides , negatives need scanned again.

 

thanks help!

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