The beta period was a bit unstable. LR had more DOA builds than we would have liked, and sometimes we fixed one thing just to find out we broke something else. This is the nature of the beast, and now that we're nearing the end, we believe that things should be settling down.
The first release candidate update is now available so please grab it and see if it helps. If it still doesn't, you might try a new install (although we don't normally recommend this), especially if you have installed any plugins. Third party add ons can have a lot of unexpected impact as info on how to update them to X-Plane 11 is not available yet.