Looked at the crash reports that you have submitted. I recommend you to revert and stay on the Lr CC 2015.12 for now. We need to investigate the root case (there is a bug logged) for your specific case. It seems have to do with your specific version of Windows configuration. Apologize for the inconvenience. You can go to https://helpx.adobe.com/lightroom/kb/lightroom-downloads.html to download the reinstall Lr CC 2015.12 (6.12). You would first download and install the Lr CC 2015 (6.0) package and then download and install the Lr CC 2015.12 (6.12) patch on top it the base install.