Power supply going into the PIC was a PicKit2 and that doesn't appear to be the issue. I was doing all these tests on a 18F26K22 SOIC package. After you mentioned the power requirements issues, I tried it on the larger DIP package and that appears to have fixed the show-stopping issue of screen regeneration. FILLRECT still doesn't work correctly, but that's a peripheral issue for me. I can at least now use these displays for the apps I had in mind.

Thanks again for all the assistance Richard.

Troy