Changing the Space logo to a custom logo, on a secure site (https), leads to empty page loads (no content is displayed - header or footer), with only the logo being visible.
The problem is observed only on FireFox. Could not reproduce on IE.
Refreshing/reloading the page appears to resolve the problem.

Steps to reproduce:

1) Set the custom logo to the sample image attached to the issue.
2) Create a page and add an internal link to another page.
3) Upon loading the linked page, observe the empty page with only the custom logo being displayed.

Tried flushing out browser cache, the problem still persists.
Tested and reproduced with a custom .jpg and .png image.