Hi jeffvoight,
Sorry to hear that you are having an issue. At least for starters we’d like to be able to get you back inside your project, and we can probably do that by having you open to a different default map.
Go to Unreal Project/YOUR_PROJECT/Config
Open up DefaultEngine.ini
You will see a line that says EditorStartupMap= with the path to your persistent.umap
Remove the line, save the file, and try opening your project. Hopefully from here to can try to identify a troublesome asset and pull it out if necessary. One of our support engineers has been asked to look into the issue and will see if they can determine any other information.
I hope this helps.