Here is a quick post and hopefully this will help you when your stuck with this same problem.
Has your mouse cursor ever got stuck on the hand tool? You can’t change it to the wand or brush it just shows the hand!
How do I resolve this? Simple: press the spacebar!
If I have just helped you leave a comment and say thanx!
post was brought to you by Levi Freeman
UPDATE: This was posted way back in 2009 and today (2016) it is still helping people. : )
Filed under: application, general, click, clicking, cs3, cs4, cursor, hand, handtool, help, mac, mouse, photoshop, problem, stuck, trouble, unresponsive, weird, windows