Everything says "error"?

[markasoftware]

Write now every line says error except for Youtube, in multiple browsers, even though for some of them it successfully logs out.

[wikijm]

Same issue for me, except for YouTube which is 'OK' even if I'm still connected on website:

EDIT: No ad-blocker was launch during test.
Exact same on Internet Explorer 11.576.14393.0 and Firefox 51.0.1