the url in the forum will be http://nameofsite.com/networks/groups/ …
then after someone responds it is:
http://nameofsite.com/networks/networks/groups/ …
not sure if thats normal – thats why i am posting again to see if it does that on this site
that seems to be why i am getting the 404 but why is it adding the name of the group on a second time?
manually updated wordpress but that didnt work – going to try previous version
man nothing is working 
usually i find a solution to these kind of problems but i am fully stumped. My site is super active too and this is the longest it has ever been down. Heeeeeeeeeeeelp!
also when i click on the activity link i get the 404
what is going on?
Sort of suggests your permalink structure is messed up, have you tried reselecting and saving the permalinks?
btw when posting example links use the reserved domain ‘example.com’ reserved for this purpose by IANA
Thanks for your response. I did try saving permalinks, but I am going to look into that again. Thanks.
going to try deleting site. re-installing from scratch, and restoring database. That will all be new to me.
I am having an identical problem.
@octapie you have started forum topic here.
@serveandshare Are you still having that problem?
Don’t know if this is the same case for others, but I found that my bb-config.php file had a couple of empty lines at the end, which was causing a 404 error when posting a group or a topic in a forum.
Once I removed those extra blank lines all worked great.
Firfox led me to the answer by stating that the headers had already “started” in the bb-config.php file.
