Problems with keywords and copyright to tiff images

I am haveing problems with some of my tiff files taking keywords and copyright information in Bridge. If the file is smaller the 1 gigabyte then Bridge is able to to post my keywords and coyright information no problem. So I have been trying to keep my medium format scans to less then 1 gigabyte. However my 4x5, large format scans are about 1.4 to 1.5 gigabytes. Sometimes Bridge will put keywords and copywright information in the file other times it does nothing. I was having one of the Adobe people on line try to fix the issue and he came back and said it is a bug in the software. I hope you fix this real soon. You have had this problem for at least serveral years. I am planning on scanning a bunch of more 4x5 and would like to be able to keywords and copyright information on each one of these images. If someone has a fix for this problem I would be interest in it. Thanks Byron