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I'm trying to login using the advanced setting by scanning the posting bar code. The app just hangs forever once I press login.

You should make sure that you are connected to alive server. Settings page and see if Server field has green check if not, change to the one which has green check and save changes. Try again login!

Problem is on the Steemit side. Bar code does not change when private key button is pressed. I assume the bar code only works for public key. Once I copied and pasted I was good.
The settings and advanced login screens are buggy. Both jump the cursor down a line after typing so the cursor is no longer in the text box.

I see.... What iOS/Android version are you in?

best regards mr. @good-karma
I come from indonesia, follow me @rizkisyahmaulana
I just use my auxiliary esteem application, help me and vote me.
thank you @good-karma.