[CS4] Can't drag images around

i've used photoshop extensively have never run particular problem.

 

suddenly i'm unable press space bar , mouse drage images around in main screen.  doesn't matter 1 of screens available pressing `f'.

 

its image made of 4 layers.    loading single layer images has same result.  unable move image around in screen area.

 

for example if blew image ctrl-+ , wanted work on not visible in screen press space bar, hand, , mouse drg desired area view.   can't now.

 

i did reboot machine incase unusual process problem... did not help.

try resetting preferences: http://forums.adobe.com/thread/375776?tstart=0

 

on other hand, if hand tool doesn't activate when hold down space bar problem keyboard (dirt under space bar key)

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