I haven't seen anyone else with a new Alta who has said they're having issues, so you should probably troubleshoot what is going on. You say your steps aren't syncing. Are you getting a Fitbit Calorie Adjustment? Do your accounts (both on Fitbit and MFP) indicate that they're connected?

I'd recommend reading the FAQ found in the stickies, if you haven't already. Here's a handy link: http://community.myfitnesspal.com/en/discussion/10098937/faq-syncing-logging-food-exercise-calorie-adjustments-activity-levels-accuracy/p1