At the moment, the suspect picture is behaving perfectly normally. As John says, if we select just the image it does not go negative but, if we select it as part of something else, it does.

We did the experiments John suggested and the "find" function does stop on all paragraph marks in the vicinity of the image. Also, the cursor always goes to the left of these marks.

On the other hand, everything now behaves normally so we might have inadvertently fixed the problem.

Bev and Jerry