even with the latest patch and the import screen disabled I get lockup on the second image. first image works fine and allows adjustments exports etc but on return to catalogue it locks when I select a second image to work on and click develop. This is just since the upgrade 5 days ago. Lightroom 5 works fine (bought as standalone - not part of the CC application)
LR CC 2015.2 / 6.2 has many serious problems, only some of which are fixed by 2015.2.1 / 6.2.1. Many of us recommend that you revert to 2015.1.1 / 6.1.1: How do I roll back to Lightroom 2015.1.1 or Lightroom 6.1.1? . Wait until Adobe cleans up the mess, and let others do the beta-testing for you.