This sound like a cross domain issue. That is why ajax is not working. A solution would be to find a plugin that allows for JSONP calls. If you can not find one that fits what you need, let me know I can fairly easily add it to the appMobiDev plugin
If I can ask, what are you looking to use Ajax for in your games? Is it for saving scores, game data, etc..? If so, checkout our playMobi plugin
. That is our cloud service for things like leaderboards, badges, game data, etc...
Again, just let me know if you can't find a plugin to fit your needs. I'll be more then happy to help out and add jsonp actions to he appmobiDev plugin.