Have you got any guide to keep the chain on? I converted a road bike to single chainring once and ended up having to put the front derailleur back on because the chain fell off too often without it.
No it doesn't have anything like that. If it happens too much at Dryandra this weekend with the potential for sticks going through the chain, I'll have to do something like that. The guy at the bike store said something about it happening far less frequently on single front chain ring than on two or more but I don't believe that. I never have an issue on the Anthem (three rings) and it was only ever a problem on the XTC with two and even then only after the first time I put a new chain on.