There’s a hot fix for the latest Lightroom update, available right now.
The list of what’s new is very short: “It stays open!”
The Mac crashes are (hopefully!) fixed and performance problems caused by the Add Photos screen are also thought to be fixed.
Before you ask, there are no additional changes to the Import dialog in this update. It’s more complicated than flicking a switch, and the immediate priority is to make a stable release available, but discussions continue.
To install it, go to Help menu > Updates. If you’re using the CC app, the update might not show up immediately, but quitting and restarting the app should be enough to trigger it. If it doesn’t show up, here are the patch links: Windows / Mac
We don’t yet know whether there are additional bugs yet to be found, so I’d still recommend caution on production machines.