Not a serious problem but annoying one, after updating Facebook messenger from app updates section every time, the app loading forever on first start. White dots spin and spin and the conversations don't load. The only way to fix it opening messenger on iPhone and going through settings - Apple Watch section and changing one quick answer anything you want and go back. And now the app loads without any issue. Is that something about my watch or totally app issue? Did you see that one also on your watch ?