I just found the problem. Right after the last time I used PPP, I downloaded most of the eye texture files in this forum (the "Contacts" zip files). For some reason, having that many eye options was stretching the PPP screen down beyond what my display could handle. I had no way to scroll down, so I couldn't see the missing button.
I started deleting eye files until the screen was fixed. The button was indeed hidden from view. You kind of pointed me in the right direction. Thanks.
Ed