Hi
"This I couldn't duplicate. Possible PC resource problem??? "
Could be....Still using the same PC!
With regards to the disappearing image.....
One would normally normally swipe the whole scale % value (100.00) and enter 90 or posiibly 90.00.
Entering 90 leaves the value as 9.00 and the image shrinks? to nothing....(?? 9% ??)
Swiping the 100 and entering 90 also gives the value 9.00 and image shrinks to nothing...(?? 9% ??)
This maybe what EmmaMc is seeing?
If I swipe the integar 9 and enter 10 the result is 1.00! The image REALLY disappears!! 
If I swipe the whole of the 1.00 and try to enter 23 what comes up is 32.00!! 
Either way it is a bug.
Nat