VPULSE source exhibits different behaviour for 'static' and 'periodic-autonomous' circuits!

In need of a step source for my .tran simulation in Cadence 5.10.41 and Spectre 7.1.1 environment, I chose a vpulse source from analogLib. But it refuses to toggle and stays put at the same intial voltage level of val0 in an autonomous circuit, whereas it works as expected when I use it in static circuits without a periodic operating point. I presume, the circuit type should not have a say in the behaviour of the voltage source, or should it ? Here's the part of the generated netlist describing this source: ----------------------------------------------------- V1 (net020 0) vsource type=pulse edgetype=linear val0=700.0m val1=1.8 \ period=250n delay=50n rise=1p fall=1p ----------------------------------------------------- I cross-verified that the $CDS_Netlist_Mode is indeed 'Analog' and I ran the .tran for 1.5us which is obviously larger than the period of the vpulse. Any inputs on this are utmost welcome!! Thanks a lot.