Whenever someone is not logged in/registered to the forums there is an "Unable to add cookies, header already sent." error on the costum page.
I just did exactly what was told in the first section of
https://vborg.vbsupport.ru/showthread.php?t=98009 and I run 3.8.4 patch 2 with PHP 4.4.7 (but I expect it would be pretty much the same as with that version as I couldn't find any updates on it).
If anyone could help me, an even more appreciated fix would be that the people in question gets redirected to the log-in page whenever they are not logged in.
Thanks a lot in advance!