That MIGHT be the route of the problem. Your individual switches seem to be in the same position as ours, but it is worth trying in the other position - they only gave a 90 degree swing from my experience.
Your photos are excellent and are VERY clear, well done. As a "Junior Member" you may run out of free posts - please sign up as a full member so that we can continue to offer help that you can respond to, it is very frustrating not to get any responses !
Checking whether ANY appliances work will be a real value as to the site of the problem. Sadly with the push on regs you cannot check that gas will flow when the cylinder is disconnecte- I suppose it is possible that the regulator is not opening the cylinder when it is fitted...... Can you hear / feel gas sloshing in the cylinder ?
I am assuming that the cylinder is at a "reasonable" temperature ? Silly point, but butane (the blue cylinder that you have contains butane) does not give much of a flow pressure if the cylinder temperature is much below 10C as it does not "gas off" or effectively boil, enough to operate appliances.
Silly points I am sure, but I hope that we CAN identify the problem. Your glass lid LOOKS fully open, but it may be worth checking...... of course, checking each appliance will prove whether there is any glow through the regulator - my guess is that this may be the problem if no appliances work....
Thinking of ALL the front line staff working to try to help others;Doctors, nurses, paramedics, cleaners, NA's, catering staff, support services and all others. Their work is appreciated more than you can ever realise-keep strong and safe.
Remember Jo Cox and what she stood for.
Any comments above are only MY OPINION and should be read as that.