Part of first column disappeared

Hi, I'm using Word '07 and have a large table that goes to the extremities of
the page. I inserted an image into one cell and resized it to fit into the
box and immediately after this I noticed that almost a third of the whole
first column had disappeared from the screen. I have not changed the margins
of the page or the cells in question. If I highlight the surrounding text,
the missing bits are copied onto the clipboard still, I just can't see them
in the document anymore. I have restarted word but this has not helped.

I have other documents in the same format and these are still displaying fine.

Thanks.