Electrum 2of2 multisig both cosigners share the same priv key
Please attach the transaction in question (partialy signed), no software I know of can spend it, but I'm pretty sure I can do it by hand. Basically you just need to duplicate the signiture and update some lenght fields and such.

(you can ping me on the freenode irc, nickname "lnovy" if you don't want to share the tx here or I'm not answering you here)