Can't login to iPhone app even after resetting password. Upgraded on website just before.

[Meteorlaszlo]

Just paid for an upgrade on the website because there was a cheap offer (it wasnt offered when I pressed upgrade inside the app so I did it from the website). I already had it installed on my phone but it didn't recognize my upgrade so I've signed out and thought it'll be refreshed upon re-login. However, it doesn't let me login any more in the app it says "either username or password is incorrect". I've even reset my password and waited a bit but it still doesn't let me login from the app with the same error message. I'd never logged out before but it worked fine until this logout. What can I do?