I'm using the Language Bar in Windows 7 to switch between English and Japanese. In 'Japanese' mode the bar has a few extra buttons for switching between the various alphabets / width styles - image 1:
However, occasionally the buttons switch to a state where they are seemingly 'locked', i.e. they can't be pressed or changed (image 2)
I have no idea why this happens, and it prevents me from switching between the alphabets I require. What causes this?