Can't see VB controls

I have a worksheet that has a few VB controls on it, such as text box,
object/pic container, and combo box. I'm able to see the controls.
However, there' s another user that can't see these controls----
instead he sees and empty "control" with a square red X. It looks like
when a web page tries to load controls but shows a box with red x
instead.

Any ideas what might be causing this? The workbook is on a network
share, but he and I have the same rights. The way the controls don't
show make it seem like a web page that fails to load...but this has no
web controls...nothing to do with a web page.

Any help is greatly appreciated!