Excel Comments boxes change size - V. annoying

[Mick]

In a data sheet I have used comments boxes to illustrate
my subjects, with a photo as the 'fill colour'.

The trouble is although I have set the 'Size', 'scale'
to 'Lock Aspect Ratio' and Properties to 'move but don't
size with cells' - The comments boxes keep changing not
only size but aspect ratio as well - this negates the
whole point of putting in the photos.

How can I overcome this?

thanks

Mick