I came across a strange problem in Illustrator CS6 yesterday, and similarly today, Photoshop CS6 spacebar shortcut for hand tool stopped working too.
In Photoshop CS6, the default behavior of holding the spacebar as a shortcut for the hand tool was working as expected. Yesterday it stopped in Illustrator CS6, and today I noticed the same issue in Photoshop CS6.
My first reaction was to go the system Preferences to see if anything had changed in the settings. It all looked as normal so I pursued my quest on Google…
It seemed to be an old post, but I found a solution when Googling for that spacebar shortcut issue…
According to this post on Adobe’s forum, certain browsers or browser extensions seem to break up Photoshop CS6 spacebar shortcut (applies to Illustrator CS6 too).
The solution seems to be simply to quit your browsers and launch them again. You might need to quit/launch Photoshop too.
So I quitted all browsers as well as Photoshop, restarted them… et voila, it was working again!!