Not sure what caused this.. Will keep trying to replicate it to give more information, but i am aware of it happening to myself and another person.
When going to research it would not let me put any amount into the first slot..
Example, If i try to refine Steel I could not put any amount into the slot 'Iron' but I could put required amount into 'Coal' . This was the same for everything available to research, where there were 3 slots, only the first slot was bugged, 2nd and 3rd are fine.
A relog fixed this for both players.
