Thank you for letting me know of this issue.
I have been changing forum skins to test other options, this could have caused all the accounts to log off, if that is the case, this should no longer be problem.
Also, make sure you always tick the box that says "Log me on automatically." Probabably you already do, but I still say just in case.
Now, has this been happening pretty often?
If so, since when?
Does it log you off again after a certain time?
If so, does it makes a difference if you are being active or if you left the tab open but unattended for 15 or more minutes?
I appreciate any details to help me understand better the situation.
If anyone has a similar problem, please let me know too.
Thank you all in advance.