I've been using photoshop for quite a few years now and have never had this problem. I'm trying to create an ad and I need to drag my selection from on image to another. Usually I just select the area I want and can drag and drop. I just got a brand new Surface Pro 3 and this is the first time I tried it on this. Please tell me that it's not the computer. :/ I would be very bummed if I spent this much money on something that doesn't even work Photoshop to my standards. Anything helps! Thanks!
Please try and reset the preferences of Photoshop once, and see if it helps
How to reset the preferences : Preference file functions, names, locations | Photoshop CC 2014