OK. So I did go to Output and Collect Textures and made that Full Size. The files, by the way, were all turned into .jpg files when the textures were collected. The temp folder file remained a .tif file, named d2.tif. I did NOT get the error messages from the Log about not being able to access the temp file.

This time, it looks like the eyes are going to render OK. So, maybe that was it. I need to Collect Textures at Full Size and Output them.