Reporting back that the issue has been fixed for me. I think it was after this most recent BI update.

Can someone please explain what this command does? /admin?camera=x&mdelay=x Delay motion detection on camera x (short name) Also, what is the trailing x variable? I was thinking an integer representing seconds for the delay? I would like to temporarily suspend motion detection for a camera with ...

Just created an account to say I am experiencing the same. I also am using 5.3.3.16 and firefox