Ugh ... sucks ...
Been there a number of times already! =/
I have a dual regulator from Northern Brewer (before I knew to buy TAPRITE) that's leaked a tank three times on me ...
It doesn't just leak it straight away, far from it ... it just decides to leak at some rando point ... usually tied to when I've changed the temp between being in a freezer or out in the room ...
Super annoying ...