Hmm is this happening with a Harman license? Or when showing a Harman splash screen without a license? And since you brought up the older AIR versions working, is this problem only happening in the 64-bit build from AIR 33.1, or is it happening in 32-bit builds from AIR 33.1 as well?
Kind of hard to say what could be causing it without knowing anything about your app itself (what you're doing in your app logic at startup, etc.), have you tried checking logcat or debug builds to see if there are any informative errors appearing there?