I know some folks have complained about other peoples signatures and I had planned on posting how to disable this. I forgot to though, probably because of senility.
So, before I forget again, and for future reference for myself, disabling other players signatures is very, very easy.
After logging in to the forum, go to User Control Panel - Board Preference - Edit Display Options. Then, under "Display signatures:", select 'No'.
That way those who don't want to see them, won't, and those that want to have them displayed, will.
It's a win-win for everyone.