I'm having a similar issue.
I used the same trainer set I have on my corona before it croaked and it worked fine.
With the trinity i have now, if I boot the xbox (its the same whether i boot to aurora or the default xbox stuff and start aurora from xexmenu) and start a game with the trainer, it freezes.
If boot up and start the game without trainer, it always starts fine.. I exit out, and then start with trainer and it works. It's annoying but the workaround seems ok.