Simulation isn’t loading Unit 4

Opening Unit 4 and everything except for the simulation loads

I have done these below to try and troubleshoot but I don’t think its my end
Have waited an hour
Logged out and logged back in
Cleared Chromes Cache

SImilar issue. simulator not loading

Is this still happening to you? Can you try switching to a unit with another simulation (like unit 8) and then back to unit 4?