[TxMt] Problem with TM2 and Mekentosj Papers 2 citekeys

I've been using TM2 for a year now, mostly for Haskell, C, and Go development. Recently, I've transitioned my LaTeX workflow to TM2 (from TeXShop; I never used TM1 for LaTeX) and am noticing a problem. In a LaTeX document in TM2, if I invoke my hotkey for Mekentosj Papers' citation feature, and try to insert a citekey, it instead inserts the _previous_ contents of my clipboard (whatever I'd previously copied). In any other application I have tested this in (Terminal, Mail, Sublime 2, TextEdit... I no longer have TM1 on my system) this works as expected. Ideas? thanks, Noah