Can't send transaction with "Max"

In master from this morning

How to reproduce:

• Select an account
• Select Max
• "Next" then enter the password.

I get this (overflow of the error message + can't send): Edit, in the console:

ws.js:262 signer_confirmRequest(["0x5",{},"my_password"]): -32010: Insufficient funds. The account you tried to send transaction from does not have enough funds. Required 1042628665000000000 and got: 1033964000000000000.