In cs5 my brackets for resizine tools occasionally stopped working. I would restart and all would be well . . for a while. I figured that there was something wrong with cs5. Now I am getting the same thing in cs6. Is there a fix?
Have you tried a different keyboard?
Check your system's region and language settings and turn off the language switching in your system tray. Most of the time this is simply a case of accidentally switching keyboard layouts...