Worked fine on old PC, cannot connect or host on new computer

okay, almost a week, and  no help; I don't want to seem entitled, but, I literally can not play the game, and kind of hoped this official forum could help.  Again, I don;t want to be 'that guy' but,  I think  (a few hours short of) waiting a week is enough time to speak up.  Not being ride or demanding about it, but, this is really something I was hoping to get resolved. 

Got help on Steam Forums. If anyone else has the issue, it was due to old mods, so outdated they broke things.