Control Panel
Personalization
Text input settings
Thumb board (4th tab)
Launch via rocker key

- not the easiest thing to find!

i noticed that the big thumb keyboard does not come up anymore when I touch the screen with a finger. I remember, though, that it has worked before. Now only if I use the middle (return) key after the small keyboard comes up I can have the big one.

Very strange - I checked the settings and changed the sensitivity of the thumb keyboard, but it does not work.

I can't seem to make the big keyboard pop up reliably on my 770 either. It's very frustrating, why the heck couldn't they have put a damn "go to big keyboard" button on their little keyboard?

If your finger is too small/you press with too little "area" of your finger on the screen, it will not be able to tell you aren't using the stylus. Try pushing "cruder".