I too have the same issue and though this app seems nice it prevents me from typing my password and thus makes this tool useless. I don't think this would take long to fix and it is definitely a top priority issue !
Ps:having to go on a forum, create an account and wait for an administrator to activate it is, as a user and fellow developer, a horrible and long way for your users to provide important feedback while a simple support email address or radar website would make reporting way much easier....
I found the trick, you have to choose US keyboard somewhere in the app configuration. my Mac has a the bluetooth keyboard, which has this configuration. Since I have this, no more mess with the keyboard...oh, and the opacity is better where you don't temper with it, it is more stable with it. Regards, LeFrog