OK I did a stupid thing. - I upgraded to windows 10.
Now when I make changes to the Description / Caption in the stationery Pad, push the save and move to the next image, the caption is changed.
If I now exit Photo Mechanic, and look at that image the changes I made to the caption are no longer there, even I I reopen Photo Mechanic and look at that image again, the changes are gone.
Please held if you can, I suspect windows issue, specifically not alloeing me to make changes to the disk even though I have administrator rights.