When you return from the Marketplace screen to the main menu, the game tries to refresh any profile characters that were based on classic skins. There are two problems with how this works:

• For a skin from a Marketplace skin pack, it replaces the profile character with a persistent loading bar animation. Clicking the Profile button and returning to the menu restores the character.
• For a skin from a custom skin pack, it deletes the character and replaces it with a default character. Also, if the other 4 profile characters were all empty it puts Steve and Alex into two of them, which results in having three default characters (two of them the same).