I am running Photo Mechanic v5, Build 17719 on a Surface Pro3 with an Intel Core i5 processor and Windows 8.1 Pro. A while back, PM started asking me intermittently for the license key at launch. Not every time, but frequently. After I enter the key that I have, it works. Any suggestions on why the software isn't remembering that it's registered? It's a hassle to have to reenter it so often. Many thanks in advance!