The February 2018 Lightroom updates are now available. Lightroom Classic includes a new tool called Enhance Detail. Lightroom CC has lots of big improvements on the desktop, including HDR Merge, Panorama Merge, Targeted Adjustment Tool and more. The Lightroom Queen eBooks are already updated for the changes.
We're hearing quite a number of reports of crashes in LR6.11 and earlier on High Sierra. It appears that Apple made some notable changes in High Sierra that affect Lightroom. The fix is to upgrade to Lightroom 6.12 or later. I haven't come across another reliable one I'm afraid.