I was painting a French fighter last night (Paasche VL with Tamiya acrylics), did the gray and brown first. When I started the green no paint came out of the airbrush, just air. Tried both a closed bottle and open cup with the same results. The airbrush seems clean as far as I can tell, connections secure, openings open, etc. I tried briefly sticking my finger over the nozzle, air bubbles into the bottle but it just doesn't draw up the paint. I recleaned, waited a while (sometimes that works too), but to no avail. Seems like it must be a simple problem but I'm baffled. Any suggestions?