The following RPMs from Red Hat's 6.0 errata download page give the "size md5 GPG NOT OK" error when rpm -K is run with and without --nopgp: SysVinit-2.77-2.i386.rpm bind-8.2.2_P3-1.i386.rpm linuxconf-1.16r10-2.i386.rpm linuxconf-devel-1.16r10-2.i386.rpm netscape-common-4.72-6.i386.rpm wu-ftpd-2.6.0-1.i386.rpm ypserv-1.3.9-1.i386.rpm The same error message is given with the --checksig option, also with and without --nopgp. This is rpm 3.0.2.
Hopefully this isn't unfit to add, however this bug is also associated with bug report 10815 (or vice versa), and I submitted bug report 10812 for the same error condition regarding Red Hat 5.2 errata update RPMs. This comment is only to assist your organization, if this is helpful. I wanted to add the contents of 10815 to 10813, but didn't get the Show bug report by # to work and now realize that I had entered 10831.
*** This bug has been marked as a duplicate of 10812 ***