Different readings of voltmeter on simple circuit
I suspect the impedance of the virtual meters is infinite - breaking the circuit. You may get better results by putting a 10 megaohm resistor in parallel with the meter.

Edit: this modification of your circuit clears up what's going on. 



Falstad makes three simplifying assumptions:

(1) It defines an absolute voltage for purposes of simulation, rather than real voltages which are defined between two points.

(2) A voltmeter with nothing on the other end therefore produces a voltage as if the other end was connected to zero volts. Real voltmeters do not do this.

(3) Voltmeters have infinite impedance.

(4) In the original circuit at the top of the page, it looks like it arbitrarily decided that the positive terminal of the battery was to be used for "absolute zero voltage". That explains all the rest of the readings - the resistor and the right-hand terminals get assigned "absolute zero".

Not entirely broken, but all you're doing is showing how the simulation is a simplification of reality.