I am trying to understand the NE555 IC in astable mode, I prototyped a circuit using "Circuit Wizard" student edition as shown in this video http://www.youtube.com/watch?v=SX01x1z7fTY at 05:36 (screenshot below) but strangely my version doesn't go in astable mode but only flashes once.
It seems like pin 7 never discharges the condensator (I tried varying the resistance but it has no effect, what is strange is that my circuit is identical to the one on the video).
Below the youtube version and mine, one flashes the other not. Do I have to set some weird setting in Circuit Wizard or is it some bug in my version?
EDIT: the dots in red, blue, green and purple is where I have put the probes and the logical levels are superimposed below the circuit.