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Describe the Bug:
Takklemaggot when returns from graveyard then it targets the creature.
I had enchanted my creature with Takklemaggot and when it died I wanted to enchant AI's Gigapede which has shroud but it came as an enchantment to by battlefield.

Which card did behave improperly ?
Takklemaggot

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2014/12/20: Commanding 2014 Urzas,duel

What exactly should be the correct behavior/interaction ?
Takklemaggot when returns from graveyard it doesn't target the creature.
Relative ruling:
10/1/2009 The player who controlled the creature that went to the graveyard (and caused Takklemaggot's second ability to trigger) chooses what creature Takklemaggot will return to the battlefield attached to. The creature isn't chosen until the ability resolves, so no player can respond between the time the creature is chosen and the time Takklemaggot returns to the battlefield attached to it. The ability doesn't target a creature, so a creature with shroud, for example, can be chosen. However, only a creature that can be legally enchanted by Takklemaggot can be chosen, so a creature with protection from black, for example, can't be chosen. If the player can choose a creature, he or she must do so, no matter who controls it. If the player can't choose a creature, Takklemaggot returns to the battlefield as a non-Aura enchantment, and that player is the player that Takklemaggot will deal damage to.

Are any other cards possibly affected by this bug ?
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Fixed in 4a0c565

When creature enchanted by Takklemaggot died a copy appeared on the bf and I was asked to choose a creature. If I tried to choose a Gigapede (who has shroud) a new copy appeared on the bf and the choice was not accepted. When I chose a creature w/o shroud all copies on the bf disappeared and attachment occurred.

So if the only creature left has shroud, you get an endless loop and have to use task manager to kill the program.