Got "TypeError: Object 31 has no method 'abs'" on sending (not related to transaction notes) 3 different times, might be an error while gathering inputs.
Once it pops up it doesn't allow to send given amount anywhere. I'd suggest not using blockchain.info until fixed.
Edit: not only me (though I got object 31 not 51 and don't have any rejected transactions).
I had returned bitcoin transaction on my blockchain wallet, I guess the fee was insufficient and now when I try to send those funds I see " TypeError: Object 51 has no method 'abs' "
Has anybody ever had this error with blockchain?