Just wanted to add, that the freezing not only occurs in inventory, but also in character-screen. And just for the sake of completion: Win7 64bit, i5 2500k, GTX760 latest driver, Steamversion, fullscreen, unlimited framerate, hardware cursor and vsync deactivated. I encountered several freezes in inventory (about 4) during 4-5h gameplay + the last freeze in character-screen. I wasn't doing anything in the char-screen, just had it up and was short time afk (maybe 2-3 minutes), when I got back it was frozen.