Title says it all.
I had only just logged in 10 mins prior and done a few monolith missions on my FG when I noticed a troll in chat and tried to block them to no avail. Right clicking their player name in chat and hitting Block Player no longer actually blocking. Still able to see their messages and their name is not being added to Blocked Players list.
Exiting the game and re-opening via Steam did not fix the issue.