Embedded xls appear as black rectangle in pdf?

To all,

When printing a mathCAD document to PDF (using PDF creator) all embededd excel spreadshees are not printed properly. All I get is a black rectangle where the xls is. Any suggestion(s) or work around?

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Update

For some reason one always find something (possibly) relevant after posting the question !! Found a thread giving the following 2 links but cannot access them

http://collab.mathsoft.com/read?115413,11e#115413

http://collab.mathsoft.com/read?112852,99e#112852

Any suggestion on how to access them?

Thanks

Regards

JXB