I've installed E-Tax 2010 in Crossover 9.01 and got it to work right up to Lodgement, when it stops. It seems to be when it does the security check prior to Lodgement that it stops.
I previously installed it in Crossover 8 and it wouldn't work. I then found out that Crossover 9.01 was out so I installed that, and saw something on another thread about needing Internet Explorer so I installed that in the same bottle. Basically it works but flashes a lot so it looks like it isn't that stable. It also won't do the little things like Pre-filling or Rollover.
I imagine there is something missing that it is looking for.
Anyway, I'm not going to worry too much, my refund is only $38 so I won't be burning midnight oil to try to get it to work, but if I think of how to get it going then I will try.