So, I cannot drag and drop at all in Solidworks. It is my primary way of adding parts to assemblies and opening parts. I used to be able to but, now I can't. Nothing has changed on my PC just one day I couldn't drage and drop anymore.

I have an Asus, i7, hyperthread to 12 cores, 32Gb Ram, 2.33Ghz, Win 7 Pro, Solidworks Priemium SP3.