An update--
I removed the Gimp-print and installed PPD's for HP printers but the problem didn't go away. So, yesterday I decided to figure out what was going on by trial and error. After about 4 hours of fooling here's what I found:
The documents that are a problem are all one-page Word docs which have a lot of tight formatting in them--graphics, Word equation editor equations and tables in addition to text. I finally found that if I put a page break somewhere about in the middle of the doc then the two seperate pages printed fine. So there's no problem in the document itself, just that Panther can't handle a single page that's too complex. Interesting to know, but the info doesn't do me any good because, of course, I want to print the docs as single pages. Since I made the orginals of the docs last fall in 10.2.8 and they printed fine, the problem lies in Panther. What to do now? I guess just reformat and reinstall 10.2 (and all my software, etc, etc).
Unless someone has any other suggestions.