I am unable to add a new layer, duplicate an existing, and copy/cut from an existing. I am fairly experienced with Photoshop and have never run into this problem. I am working on version 5.5 on a Windows computer. Please help me.
-Christina
#1
What colour mode are you in?
Is the file 16 bits/channel
#2
RGB : 8 bits
#3
Try closing the file and restarting. If that doesn't help, trash/reset Preferences.
#4
I did that and it didn't change. However, I can create a new file and add layers.
#5
My bet is that you are in Indexed color mode? Check Image>Mode>RGB
#6