If in the past 2-3 days you've experienced the "logged out bug" (logged out on the main page but logged in on remaining pages), I've a few questions:
- have you seen "Login / Sign-up" in the menu bar instead of "My Account" sign or completely nothing?
- what browser + version + OS were you using when you've noticed the bug?
- were you able to replicate that on every visit / refresh or was this happening randomly?

Thanks in advance.

We're currently investigating the issue. You can try to clear all your gog.com cookies and loggin in again to see if it will resolve all problems.