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Describe the Bug:
Gideon Jura's +2 ability, when activated by the player, doesn't force all creatures controlled by the AI to attack it if possible. In some cases no creatures attacked it. In other cases only a fraction of the creature's controlled by the opponent attacked.
It seems like unprofitable attacks, i.e. having to attack with creatures that die when blocked, influence the attacking behavior, but that might as well be coincidental.

When the AI activates Gideon's +2, the player is not forced to attack with any creature at all in most cases.
Sometimes a single creature has the orange/red highlighting instead of the yellow one, in which case it can still choose to attack AI instead of Gideon. This happens rather randomly, though, and wiping the board with a Wrath of God and then recasting the same creatures that were on he battlefield before in the exact same order doesn't reproduce this, i.e. the creature that was formerly forced to attack won't be forced, despite the board being the same as it was before the wipe.

Which card did behave improperly ?
Gideon Jura

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
CoRM15, duel

What exactly should be the correct behavior/interaction ?
Gideon Jura's +2 ability forces all creatures controlled by its controller's opponent opponent to attack it if possible.

Are any other cards possibly affected by this bug ?
Also tested Siren's Call -> same bug (creatures that were able to attack but didn't are destroyed as intended)
Also tested Alluring Siren -> same bug
***Edit: Nettling Imp -> same bug

Taking into account the Ruric Thar & co no forced attack bug and the Goblin Rabblemaster inconsistent force attack bug, siren/Instigator and Juggernaut effects might just be bugged globally.

Global bug: it's fixed for Gideon and the others in 29f8c91

Still bugged, at least for Gideon Jura, Siren's Call and Nettling Imp.

Well, this is really a strange one: apparently, the internal flag with passes EVENT_FORCE_ATTACK could be set only for each player separately, so I'd be forced to have the effect card created on the opponent's battlefied.
Works for Gideon Jura (tested), it's more difficuly to say for the other two cards, just test it and let me know.
Fixed in 4fe53fc

Gideon Jura doesn't always make everything attack (Opp had an Advance Scout and a Living Lands w/ 5 Forests and only the Forests attacked). Siren's Call doesn't make anything attack but sometimes kills all of my creatures at end step. Nettling Imp sometimes works and sometimes doesn't (but always kills things that don't attack).

In case it helps pinpointing the problem, Gideon Jura and other card's force attack abilities (e.g. Rage Nimbus's) used to work fine prior to CoRM15.

Fixed by Korath's 7acce7b commit here:
viewtopic.php?f=86&t=17699&p=189223#p189202