Does Photshop auto crop PDFs?

I've noticed that when I open some PDFs that have crop marks, Photoshop only opens the are within the crop marks - therefore cropping out any bleed on the original PDF.

Is there a way I can stop it doing this?

Thanks

What version of PS are you using? I'm at work using CS and PDFs open with all bleed and crop marks intact.

Maybe it's to do with how the PDFs were created or saved in the first place?

I'm using PS7.

I had thought it might be a creation thing as not all PDFs are causing the problem, but if there's any way to stop it happening I'd like to know.

This might sound crazy but I've seen this before and .... are you sure they aren't there? Of course if you can physically see that the image is cropped discarding the bleed I'm sure you are sure.

but if not....
Did you drop a white BG behind it?
Print it (from PS7) after opening it

Do you have Acrobat pro?
What version of Illustrator do you have if any?

No, they are definately not there - image cropped to size with no bleed whether it's flat or layered, but thanks for the suggestion.