I am having trouble creating an offline enabled web map in collector. Not sure why, but it does not give me the option to use it offline. I am using hosted feature classes with syncing and editing enabled. I have never had this problem before, so not sure why it isnt working.
When you say you are using a hosted feature class, I assume you are consuming the services from ArcGIS Online? Is that correct or are you consuming the feature service from ArcGIS Server?