Immunity

[Celestrian]

Universal monster rules states: A creature with immunities takes no damage from listed sources. Immunities can also apply to afflictions, conditions, spells (based on school, level, or save type), and other effects. A creature that is immune does not suffer from these effects, or any secondary effects that are triggered due to an immune effect.

Does this mean that if you are in a form (ie. elemental body) that is ie. immune to a condition, then you will never gain that condition (ie. bleed) and thus if you are hit by a bleed attack round 1 and change back to human form round 2 you will not have a lingering bleed effect?

Does this example count as for all conditions? (Like a barbarian with an oracle lame curse dip cannot gain the fatigued condition?).

As I read it you gain the condition either way, you just don't get any of the condition's effects. I also think that this view is supported by the Delay Poison/Disease spells, that says something about what happens if you are immune to something, but suddenly isn't immune anymore?

Or do you not gain any condition as long as you are immune?

What happens to the bleed if you bleed as a human, change to elemental body, then back, without doing anything for the bleed?

Is there an errata/FAQ on this anywhere? :)

[Ravingdork]

Note that most polymorph spells don't usually grant you outright immunities. However, for those spells that do, effects that you were immune to--and were targeted by while polymorphed--would not linger after you return to your normal form.

This should be true for other abilities that grant temporary immunities as well.

[Joesi]

I think that Delay poison isn't a good example. I think it doesn't say anything about being immune, just that one doesn't experience any of the effects while the spell is active.

That said, I don't know what to say regarding conditions. I could see it going either way, and in my opinion depends more on the specific condition at hand. Like if someone was in a polymorphed form and were hit with something like a bleed attack, I'd say that they wouldn't even have the bleeding condition when they return out of polymorphed form.
I'd also tend to say that anything immune to bleeding would not count as being bleeding with regards to taking any additional damage or feat-based attacks or anything even if they had the condition. Because of this, it makes me think that a creature simply wouldn't have the condition at all, and hence couldn't gain it when any immunity effect wears off.

[My Self]

Depends on if the condition is constantly being applied or one-and-done. For constant reapplications, (standing in a fire, breathing in poison gas, suffocation, etc.) you need to be immune at the time of application. For one-and-done effects, (charms, enchantments, being stabbed by a poisoned dagger, bleed damage, being lit on fire, etc.) you also need to be immune at the time of application. I'd say that if you were immune when you were poisoned, you should be fine, though this may vary from GM to GM.

For the Barbarian question, yes, this is a thing that people do and this applies. If you have the Lame curse and are thus immune to fatigue, then you cannot be fatigued from raging. Since there's no provision in raging saying that you can't rage if you can't become fatigued, you can rage any number of times (limited by your rounds of rage) in a turn.

For the bleeding as human, polymorphing to end the bleed, then switching back, I'd personally allow it. You're probably spending a standard action to polymorph. There are many things you can do as a standard action to stop bleeding, including, but not limited to a Heal check, a healing spell, using a special class or item ability to staunch bleeding (gunslinger), etc. If you're going to burn a spell slot to do so, I'm not stopping you. It's a fairly clever use of a spell and you could probably be doing better things with that spell.