CDR X3: Why does a bitmap image disappear when I Crop it?

Hi, people,

I im****ted a square, fairly hi-res bitmap image, into CDR X3.

When I try to Crop any ****tion of it that's more than about 50% of the
original thing, the entire image disappears.

For example, let's say the picture is of a person's face.  I can Crop
it to include from either side, to Close to the nose, and it works.
If I Crop from either side, to include more than the nose, it all
turns blank.

What's up?  It's just weird.

Thanks.

Mark246