I have no clue if my mic works - they can hear me or not. So then I could explain the folloring bugs and glitches that started happening after 20 hours... (Yes, I still love the multiplayer mod, buuut...
1st place --- THE JUMPSTYLE BUG!!!! (freshly discovered)
Slow bug. Having my running animation jammed - even while sprinting - and slowed down to a crawling speed - for the whole party - I found that jumping was the fastest way to get around. It got glumsy with melee weapons if gone out of reach.
Game break: no
2nd place --- GRAND CANYON GLITCH
So what remains are the terrain and the background (+party members). Sometimes I'm floating on an invisible deck and my computer is trying to render the floating npc-s in mid air. The block is 5*5m wide so I fall a lot of times. Mobs can kill me and I can use barrier on friends or myself.
Game Break: yes
3rd place --- THERE IS NO PLACE TO RUN
No way to run, because the glitch displaces me back and forward to previous locations in a 5m radius. Effects all players around me. Sometimes we dance in mid air. As bad as the James Bond glitch. I encountered this a few times when joining games too late.
Game Break: sort of
4th place ----- THE USELESS BUG
My mini menu failed to load. No spells (BARRIER!), nor potions. You can still play, and the game did reward me with 3 items along the way and 1 was a rare. All 4 of us survived XD and I bested them all (because I had a nice staff)
Game break: Nooot really.