If your trigger log indicated that the previous event was not settled, then selecting the Aus wallet and Aus/NZ markets should allow the program to declare the markets settled. The first bet worked, because the Dutch trigger will fire, if it has not fired previously in this session, or the Previous Event is settled.
If you allowed Aus markets/wallet and it still doesn't work. there must be another factor preventing the program from establishing the markets are settled. Obviously, update the Aus wallet every 15 sec, rather than the figure mark showed in his screenshot. Could be anti-virus/firewall issues, but if first bet is placed on the live market that is unlikely.
I personally had no problems working on the Aussy markets, although I have only traded on Tennis, as I know absolutely nothing about the horseracing