That was the issue with local saves with flash and the reason I really wanted online saves back. What happens with local saves is entirely up to your browser and how it handles cookies....
about 3 years ago there was a post on newgrounds from some guy who claimed he spoke with the creator and he said that blizzard said he could not make another game ( even though blizzard gets the credit stupid right)
 "Learn to Fly 3"){kind=icon}
 "Murloc RPG 2: Episode 1"){kind=icon}
 "Epic Battle Fantasy 4"){kind=icon}
That was the issue with local saves with flash and the reason I really wanted online saves back. What happens with local saves is entirely up to your browser and how it handles cookies....