.....
However I have some probable suggestions and reason why you got that image. Now are you sure that you tried accessing the forum via their homepage? Because my hypothesis is that you probably wanted to make a post and then you left the tab open. And by the time you tried logging into the forum some other time your login session had already expired hence you got that message.
No, I didn't make any post or anything, I just opened TOR browser and then I wanted to login to altcoinstalks and found the problem as in the screenshot.
That means your cookie session expired and then you automatically logout. This happens if you haven't check the "Always stay logged in:" checkbox when logging in OR if you are using TOR browsers just like you mentioned before.
Not like my friend, I don't want to be a Denial member but I have a case like this, the stages are like this:
-I open the notebook
-I open TOR Browser
-I log in to altcoinstalks
-I get a problem like the one in the screenshot
Note: Yesterday it was my first time logging in and had never logged in to altcoinstalks before.