So I had this issue yesterday, actually. Started the Bloodthirsty research for a ring and logged out. Some time later I logged back in and the research was gone; no ongoing research for the ring at all. It was just gone.
So today, after the maintenance, lo and behold! the research is back. BUT. But now any other research I want to initiate just doesn't start at all. I have 2/3 research slots active on clothing but whenever I try to start a new research on it I'm met with a "no available research slots" message.
Anyone else experiencing this?
@ZOS_Margarette