Hey there,
Thank you for reaching out! Yes, this is a known bug in 1.2.1, were you trying to sign a transaction from an account that is not #0? IN any case, this has already been corrected in KeyOS 1.3.0 that we are planning on releasing in beta this week, so if all goes well expect a full release sometime next week.
Thank you,
The above was sent June 22nd
So has the update been released? I have a wallet that has over $2500 in BTC in it and I cant sign a withdral from the wallet… this is no good!