Can't paste from one document to another

I can't seem to paste something from one document to
another--even if they're both in Publisher. I can copy
and paste within the same document just fine, but as soon
as I try to copy from one and paste in another, it won't
do it. Instead, it will paste whatever was the last thing
copied in that same document. It will even show the
correct item as the last thing copied in the Office
Clipboard, but it still won't copy anything but the last
thing copied in that same document. Please help. It's
getting very frustrating! I end up making one document
smaller and dragging text and pictures from one to
another just to go around having to copy and paste!

Any help would be appreciated. (By the way, I have Office
XP Small Business--Publisher 2002.)
Brenda