Lastpass works perfectly for me everywhere except interactive brokers.
I have several accounts with them and I have tried chrome, firefox and safari. None work.
It saves the password, it uses the correct password, but interactive brokers still says no.
I suspect its something from interactive brokers end, like they know when the keyboard has been used or not. I noticed that if i delete the password but still use the username that Lastpass entered, that it still gets rejected. Whereas if i add a character after the user name and then delete it, it works.