Upgrading to W10 version 1803 created some issues for me. Back in April I submitted a support ticket because the launcher would get stuck on the 'Loading...' screen. Bethesda support could not help. I resolved the issue by rolling back the OS to the previous version. A couple months ago I thought I'd give 1803 another shot. Well, same problem. But this time, by pure chance, I opened my Firefox browser and navigated to a website while the launcher was still stuck on loading. To my surprise, the launcher finished loading and all was good. Now each time I start the launcher it still gets stuck on the loading screen but I resolve the issue by starting up Firefox and loading a web page. I've testing this out by just letting the launcher sit to see if it was a timing issue. But it will not get past the loading screen no matter how long I wait. Then as soon as I boot Firefox, load a web page, the launcher will finish loading.
Not a huge issue for me as I can use this method to get the launcher to load, but I'm very curious as to why the launcher opens ONLY when I open Firefox and load some content. Something on my system is definitely amiss.