Sunday 31st July 2016by Lionslayer
Some third-party keyboards are not working properly on OSX. When you shut down the computer or leave the computer until it automatically logs off turning on the third-party keyboard, you may not be able to change back to default English QWERTY keyboard and unable to type the login password.
Here is the instruction on how to solve the problem. This works for me with Keymagic for Burmese.