I use it esp for air drops of ERC20 tokens. But I'm having an issue ...specifically I go through the process of adding custom tokens for the air drops and then the next time I login the custom tokens I added are gone. Has anyone else had this happen?

And if I receive an ERC20 token but the custom token isnt added (since every time I add it, it disappears), what hasppens to any tokens sent to my MEW address? In other words do I have to have added a custom token to the wallet before I receive that custom token in MEW in order to receive it?