@ William @Clem
Thank you both for your interest.
I had tried to reprocess from the original, but it does not solve the problem.
The images have always been fine and have been stored on this soft RAID, outside of Aperture without previous trouble.
I am using a 2008 Mac Pro with 8GB of RAM and about 10TB of internal storage on HDD. My system is on a 128GB SSD. Yesterday I updated Mavericks and Aperture and that's when my problems began.
I've always followed the updates closely and have never experienced something like this before.
Somebody from the Apple team contacted me, so I am providing them with further infor to see if they can reproduce the problem...
There seems to be carry over/memory from one image to another.
If I zoom around the image, it clears up and I can see the photo clearly. When I return to the default viewing size, I get this effect.
However, if I view a video (no problem), when I next go to a photo, the image that appears is pure white...
Or, as is now the case, no matter which image I open, the default setting shows a photo from another project (undamaged).
If I want to see the image connected to the thumbnail I have to zoom around first...
Not sure if any of the above sounds familiar to you, but that's pretty mu much it.
Thanks again!
Ian