MS Excel 2003 SP2

I'm working with a shared workbook. None of the worksheets are protected nor
is the workbook. For some reason I can't insert an iamge on any of the
worksheets.

When I choose the Insert/Picture option from the tool bar all options after
that are grayed out.

Where else can I check for workbook sttings that would prevent this?

I hope I can get an answer to this question before our project is over. For
now i will need to figure out a work around!

Thanks,
BB