I have 7 unreadable messages.
All of them under Communication--Information. When I opens that page it's automatically set them as red but after clicking on a menu (Overview) it's appears again that I have 7 not red messages.

Yeap just before I started to create these posts. (removed every add ons too)
Using Chrome with only one page open (Ogame Bermuda).

Sure

The third one was a quick printscreen after clicking on messages.

An extra unreadable message appeared after accepting a player to join the alliance which I can't see eighter.