I have reproduced the problem here and we will investigate to try to find the cause.
Update:
Our FireTV stick Gen1 here has not got the new UI update yet so we will keep testing. Looks like it might take a while for us to get the update
http://www.aftvnews.com/software-upd...t-gen-devices/
After rebooting the FireTV if I launch the Mezzmo app the Fire TV returns to the home screen but after a few tries the Mezzmo app is able to launch and exit without issues, I suspect the FireTV may still be loading and as it loads it returns the user to the home screen. Please try waiting until the home screen has completely finished loading then try running Mezzmo.
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