Hugo.

Are you sure the bleed air switches are not moving at all? They only move a little way but you should be able to see the movement. Make sure they are pointing downwards to the OPEN position. Have you switched on the GTC Bleed Air switch to open? Perhaps the engine bleed air switches do not operate until the GTC switches are selected and there is sufficient pressure build up.
Have you tried to start the engines at all even though the bleed air switches do not seem to operate? If the engines start OK they must be in the open position.
I don't know what else to tell you, I have no real idea why they don't open when the mouse pointer turns to a fist.  Do the other switches operate when you use the mouse? Does the Battery switch operate OK? If they do operate OK then the bleed air switches should open.  Make sure the mouse hand is just below the bleed air switches, if the hand is level or just above the switch it will not work. I repeat ,make sure the mouse hand is just below the switch and then click it.

John.