[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.

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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