@mrmikel: Saving is an asynchronous process (this is because Tweak Book supports both epub and azw3 and saving azw3 is slow, because the book has to be rebuilt). So a traditional save as would not work well. However, I could implement a save copy as which will save the copy in the background at the state you are in while you can continue to work on the book. Will that work for you?
Regrading your error, it is because you have a broken plugin installed, uninstall it from calibre, and the error will go away.
@GRiker: Might be something OS X specific (I have really only tested Tweak Book on my linux dev machine so far) but send me the book anyway.
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