photoshop lock layer; how to unlock?

one layer in photoshop document has padlock on it; no clue how got there. can't make go away; perhaps method different in cs6 in previous versions...

 

any clue this? can't fill selection on particular layer...don't  know why. layer in question selected, , selection active, etc.

 

w

this layer other background?  need double-click background turn full layer.

 

if not background, when select layer click little padlock button that's above layers listed, happens?

 

if these things don't help, perhaps if screen grab , post here show you're seeing.  may clarify what's going on folks familiar photoshop.

 

-noel

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