Sporty electric window malfunction


I am a Sporty newbie having just purchased a '97 Limited, which appears to be a fairly rare limited edition(150 made?). It has an annoying electric window problem which has me tearing hair out. The EW work perfectly when the ignition is on/engine off, but after starting the engine the drivers window operates a few times then stops anywhere(the pass. window remains in operation) and will not operate again until the engine is switched off and the ignition is switched back on/engine off. I have swapped switch pack and window motor and the problem remains. There is clearly no power fault as the pass. window is ok and test meter indicates battery voltage at the motor connection ign on and 14.4v when running.I am now becoming p....d off. Anyone any thoughts(my first thought is to go back to my Rav4!)