So I was just going to start up Starbound, wanting to check out the update that took it out of early access. I click on singleplayer, but NOTHING is there. Not one character. I look in the files and everything is still there but nothing in-game. How can I transfer it back? Did this happen to anyone else?
During Beta Phase and especially with the official 1.0 release, different characters and world wipe have been done. this is because of changes in world/character generation which made unusable the old data format.
So even if you still own those saves, they would be unusable.
If you start a new character, there should be no issue from 1.0 release. In theory they should not make wipes in the game anymore. You can then use any sort of method (manual cloud syncing) to keep your game saves safe and even sync across computers