Ctrl+Ctrl, Alt+Alt and Shift+Shift???
Why is it, when things appear to be 'playing up'. Pressing the shift, alt and ctrl keys in pairs fixes a number of peculiar problems!? Had a teacher come in with a laptop. When trying to type in the username and password (on the locked screen), it went funny. The back space displayed boxes. Didn't type anything apart from space. Sometimes moved the text to the right hand side of the text box.
Managed to get a USB keyboard (there wasn't a right ctrl button) and then press the wonderful buttons. It worked fine! Does it clean the keyboard buffer or something?!