Hello, Elle,
He only appears on the tab that you have selected him on, Elle.
Now, have you done the "soft reset", that I suggested?
If so and there is still a problem, then try this.
Switch off everything that uses the router.
That is desktop, laptop, Hudl, phones, toaster etc.
Then unplug router from the wall plug, for five minutes.
Then, plug router back in, wait until the lights are on, showing "all systems go", and start up your Hudl and desktop etc.
This often helps overcome problems.
And before you ask, no, I do not know why...but it does!
I agree about the dodgy geezer in the hat!
Chrome's answer to Arthur (Arfur) Daley!