Reponding to some of the questions posed in the LIVE GAMES section....

[CAAZs #1 Card Slinger]

 :heart:On the dealer mucking your big blind (losguy)....Rules state that the blinds must be posted before any hand is dealt. however, in the real world, player distractions cause dealers to start dealing and ask for blinds as they deal.  I do this.  I do,  however, do not start any action until all the blinds are up.  That being said another rule states that everyone is entitled to play their blind hand-ALSO-the dealer is responsible for PROTECTING your blind hand--If it is mucked by you, thrown up on, etc. the dealer AT CAZ is supposed to dive on it, push it back to you, whatever, anything in his power to protect it.  IF it does get mucked or whatever, IT IS A MISDEAL.  DEFINITELY CALL THE FLOOR IN THESE SITUATIONS (if the dealer does not).
(reminds me--some players aren't aware of the fact that THEY ARE ALLOWED TO CALL THE FLOOR AT ANYTIME, FOR ANY REASON WHATSOEVER)  too many capitals, sorry, rules excite me.  All this being said, when the dealer mucked your big blind and asked you to put up twenty you should have had the floor called immediately, sorry.
     On dealers not being able to leave bets out in split pot games, even heads up...Yes this is true, rules state that all bets must be brought in before any action occurs.  This is to avoid burning and turning (putting up a card without action being complete).  That being said, when it is heads up, some leeway is allowed here by most dealers and floor people. 
     Thanks everyone and may all your flushes not be toilets........

[Aack Thbbbt]

That being said another rule states that everyone is entitled to play their blind hand-ALSO-the dealer is responsible for PROTECTING your blind hand--If it is mucked by you, thrown up on, etc. the dealer AT CAZ is supposed to dive on it, push it back to you, whatever, anything in his power to protect it.  IF it does get mucked or whatever, IT IS A MISDEAL.
DEFINITELY CALL THE FLOOR IN THESE SITUATIONS (if the dealer does not).

What????
I have NEVER seen a floor person call a misdeal as a matter of "rule" (all things being equal, like blinds were placed correctly prior to the hand starting) because a player didn't protect their BB hand.  The dealers usually will do their best to protect a hand from being mucked because of misunderstanding( like they thought it was raised but wasn't, didn't realize they had the BB and just want to fold). but it is the PLAYERS responsibility to protect their hand and their right to act on it.

(reminds me--some players aren't aware of the fact that THEY ARE ALLOWED TO CALL THE FLOOR AT ANYTIME, FOR ANY REASON WHATSOEVER)  too many capitals, sorry, rules excite me.  All this being said, when the dealer mucked your big blind and asked you to put up twenty you should have had the floor called immediately, sorry.    

This is true, a player has the right to call for the floor at any time they feel they need to do so.

[CAAZs #1 Card Slinger]

   Let me clarify.  There WILL be a misdeal IF EITHER blinds find themselves with mucked or exposed hands AND ONLY IF there is also no significant action (usually meaning the 2nd player in front of the big blind has not yet acted).  This does not happen very often, but the rule is in place to make sure that the blinds always have a chance to act on their hands.  This is a CAZ rule, I am not sure how it is handled elsewhere.
Peace and may all you flushes not be toilets.......

[Nidociv]

 Let me clarify.  There WILL be a misdeal IF EITHER blinds find themselves with mucked or exposed hands AND ONLY IF there is also no significant action (usually meaning the 2nd player in front of the big blind has not yet acted).  This does not happen very often, but the rule is in place to make sure that the blinds always have a chance to act on their hands.  This is a CAZ rule, I am not sure how it is handled elsewhere.
Peace and may all you flushes not be toilets.......

Must admit, i also interpreted your your original post to mean that if a players Big Blind hand got mucked for almost any reason it would be called a misdeal, it  was some what misleading.  Conditions are important  
The latest scenario makes more "sense" but seems highly unlikely ( as you stated).