I've owned these stoves for years, and am surprised you've got a problem after just one incident. The first thing to know, is that they can be dismantled and re-assembled relatively easily - so if you're feeling adventurous, you can take stuff apart and investigate - but be careful to have a clean surface, and not lose any small bits.
But before all that, have you tried winding the flame control all the way round, beyond the MAX flame point? Doing so should push a fine wire inside the pre-heat tube through the jet, unblocking it in the process. Do it several times, light it, and do it several more times. And tap the whole thing as you go, to knock out any particles.
And one more thing - are these stoves still available somewhere? I live in the UK, and would just love to buy another one, as my (cannibalised/rebuilt) example is on its last legs. No other high altitude stove compaers, in my view!