Bizarre Display Behavior of Equations

It's best to describe this with pictures.  Here is my editor in state 1:

When I Preview this slide or Publish this I get something that looks like this:

No problems so far, but...

When I delete those two enlarged images that are to the right of the visible area, to State 2:

And then preview the slide, I get this:

Note the highlighted area.  The equations have lost their dots in the denominators.  

I've tried a whole bunch of stuff.  Enlarging the images directly will make the dots appear again.  This is not a resolution problem as the other images are showing dots just fine.

A little history on this: Originally, I produced those images without the dots there, exactly as they appear in the final image.  I replaced them with corrected versions.  I changed them out again when this problem came up and I changed the file names.  Nothing seems to work except putting larger versions of the pictures on the page outside of view. I created this single slide version and the problem persists.

I've been trying to figure out what is going on under the hood to cause this behavior and I am completely mystified.

Below is the parred down story that displays this behavior.

Thanks in advance for any help on this.