Apache 2 and pdf files

I am having a problem with pdf files on suse 9 with apache 2 running. The files just never loads correctly. Sometimes I get blank pages others I get partial loads then an error message from acrobat saying it was unable to read the document (109) This is on an internal network so I have a fast connection. I have tested this with a 231k file. Works on RH 7.3 with apache 1.3 Some strange config option I need or what. Doug