What is the picture format? Are you sure you're inserting pictures that are supported formats?
Another thought is to make sure that the size of the picture is not so big that you only have a small portion of it showing on the screen. In Office Aps, It is possible to insert pictures in such a way to where you only see a small portion of the picture - I know I've done this in Access before (Office for Windows).
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"If to err is human, then I must be some kind of human!" -Me