[Darkwaltz4]

AllenSam: yes, deleting and re-adding would probably do the trick o.o
and yes, firefox requires a plugin to hear background midis
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lonely: the system currently requires at least one card per level, otherwise itll search forever, hence the error. im thinking of working on deck support first, as itll address all of the issues that are coming up, as well as aiding with more advanced editing (like changing levels or adding elements) as well as remove some of the hard-coded dependancies that you have.

A workaround you could use for that, is removing the option for a level 10 match from the newaimatch template, and then selecting the new BONUS level that appears, and it will allow you what you want.

the cards you select are moved into a match, and are no longer 'available' to you. this ensures that you cant resell or trade away a card that you are using. this is normal behavior, and you recieve the cards back at the end of a match, whether its played through or rejected by your opponent (and depending on if you didnt lose them because of a prize rule!)

there is not a 'no multiples' rule currently, but there might be on in the future (if i am convinced of its merit)

as per the issue i explained above, you dont need to 'return' the cards to the user if they selected to use them in a trade/match, as they will be returned automatically once they are done being used. however the deck support update might include an inventory editor.