Herm.... I don't know D:
But, when a map "Eats" someones character, it's when you are on a character, you log into a map, and FH crashes. You go to get back on your character, and FH crashes, b/c you're still in the character-eating map D: The only way to fix that is to delete the .fhm file that your character is in, and then go on the character again, and "go home".
Yes, just go home if there is no portal.
Don't understand the last one...?
I'd create a tester anyway. So, if you go into a downloaded map for the first time, and you crash, ya know :3
No. All you need to put in the zip file is: .fhm, .fho, .fhs, and .fhw.