I had a problem I encountered a while ago when I’m doing a web design project in the Adobe Photoshop cs5 and a pop-up message said “Could not use move tool because the target channel is hidden“. If you encounter this message then you are guilty by pressing the “Q” when you clicked the “Layer“, this option is what you called ”Edit in Quick Mask Mode“. see the image below.
To resolve the probelm is simply by clicking any Layer>then press “Q” or
Go to Select menu>click “Edit in Quick Mask Mode” to uncheck.
Hope it will help! Enjoy!!
Source : http://www.lee-agosila.com/blog/could-not-use-move-tool-because-the-target-channel-is-hidden/