After installing LR 5.3 (as a new Lightroom user) I have been keywording my photo collection, typically sets of 10-150 photos at a time. During this process usually first everything goes fine, but after some work has done, LR5.3 gets endless hanging. It blinks same screen endlessly and Windows Task Manager reports "not answer". There is also an AppHang transaction in Windows log file. Well, my PC is not very powerful, AMD Athlon II X4 645 3.1 GHz processor, 4 GB RAM and Windows 7 sp1 64-bit, but I'd been using this computer with Corel's PaintShop X4 with no problems of any kind. I turns to Lightroom beacause of its much better raw photo capabilities. Now I'm little bit disappointed: LR is a fine software but seems unreliable.