LR5.6 on Windows 8.1 becomes "Non Responsive" while initially trying to start and won't allow we to click anywhere. I'm not able to use it. I have tried deleting the preview folder; deleting the SLcache; uninstalling and reinstalling; uninstalling, manually deleting remaining LR references in the registry and then reinstalling. After the new installation I can open LR, sometimes I can use it a few times. Most often, if I use it and then don't use it for a few days, then try to start LR, it is immediately "Non Resonsive". LR is useless this way.