Try the steps described here: http://blogs.adobe.com/lightroomjournal/2015/10/update-on-lightroom-2015-2-lightroom-6-2-r elease.html
Additional information regarding El Capitan: https://helpx.adobe.com/lightroom/kb/lightroom-and-el-capitan---mac-os-10-11.html
"Go to Lightroom > Preferences.
Click on the General tab
Uncheck “Show ‘Add Photos’ Screen”
I have already do it, but I can't export and I have some several crashes. Nothing changes for me.
I need to export, now.
Thank you F.McLion, I didn't think to roll back. It's the best solution right now.