UPDATE: I just realized the ICON is actually showing up on my browser's tab that contains JIRA but not in JIRA itself.

ORIGINAL QUESTION:
We are using JIRA 7.13.2 and Confluence 6.13.4. The 8 bit 32x32 PNG files that used to work as JIRA favicons are no longer woking in JIRA. Newly created 8 bit 32x32 PNG files also do not work. In the LOOK & FEEL page I see the file that I uploaded and the image that should appear but outside of LOOK & FEEL, where there should be an icon/favicon, I see the icon of a broken page.

When our favicons worked, were using JIRA 7.10.0 and were not using Confluence.
Any ideas?
Thanks,
Jim