List of Known Bugs

Reply if you have anything to add or if you can verify some.

Green means fixed.
Blue means Autobans.
Purple means doesn't work.
Orange means it DCs you.
Brown means it bugs your character.

Skill Related Bugs

• Do not add to Beginner Skills as it will Autoban you
  
• KoC characters will have their skills bugged if you talk to Duey
  
• Using certain skills (too many to list) with other characters on the map will DC everyone which may or may not include you.
  

Wind Archer

• Wind Walk
  
• Wind Shot
  
• Hurricane (KoC version)
  
• Bow Expert (KoC version)
  

Dawn Warrior

• Soul Blade (Unverified)
  
• Combo and Combo Related skills
  

Thunder Breaker

• All 2nd and 3rd job skills (Unverified)
  

Night Walker

• Shadow Partner (Unverified)
  
• Vampire (Unverified)
  

Shadower

• Pickpocket (Unverified)
  

Night Lord

• Shadow Partner (Unverified)
  
• Shadow Mesos (Unverified)
  

Hero

• Combo and Combo related skills (Unverified)
  

Other Bugs

• Spinel leads you to different places
  
  1. Forest Of Golem leads to Mushroom Shrine (Unverified)
     
  2. Altar of Zakum leads to El Nath (Unverified)
     
  
  
• @supershop Bugs
  
  1. Pirates can't buy Weapons
     
  
  
• Cash Shop not working
  
• Buddying people bugs your character
  
• Sauna in Showa DCs you
  

That's all I got off the top of my head. Thanks to whoever was online and answered when I was asking for bug reports.
Hopefully we'll be seeing lots of green soon enough.