Photoshop :: Hue / Saturation Adjustment Layer In CS6 - Cannot Do Stamp Visible?

I noticed that most of the time I cannot copy a Hue/Saturation adjustment layer in Photoshop CS6. (In about a third of all cases it works, in all others I have to create a new Hue/Saturation adjustment layer).
 
Hitting Command + J will cause my Mac to make an error sound.
 
Option + delete also doesn't work half the time.
 
Also: I cannot do a "Stamp visible" above a Hue/Saturation adjustment layer. Hitting Command + Option + Shift + E will bring another error sound.
 
I have to creat a new layer, and then create a stamp visible. But half the time this doesn't work, either. Hitting Command + Shift + N will give me another error sound.
 
I have to create a different adjustment layer, then an empty layer, and only then I can create a "stamp visible".
 
Only Hue/Saturation adjustment layers are affected by this - but it's a true hold-up.