I moved Mods to the desktop.
Moved accountDataDB to the desktop.
Copied back a September 17th version (pre-update backup) of UserSetting.
Started a New Game, made a Sim, bought a house. Moved in.
New Reaper events showed up. Steps in each showed up.
Completed getting the mail and reading it. Got a reward.
Then went to Manage Worlds. (As a test because of issues I've read about on this thread)
Did nothing. Did not enter CAS. Immediately went back to the household.
The progress steps in the Reapers GUI were now blank.
However, rewards from the previous event of this summer were in build/buy. Thank you Lilsimsie for suggesting keeping a backup of the UserSetting file.
This thread and issues with the Reapers Event should not be marked as a Workaround. No suggestion offered so far marked as a Solution.
Merely starting the event and doing two steps, then going to Managed Worlds results in a blank GUI thereafter.
Console users are reporting the same issue and they do not have the option to undertake anything suggested so far. And indicates the root cause is the game code. Not the users.
The only suggestion that will work is this: Put everything back the way you had it and wait until the emergency patches come out over the next week or so. Then try to play the event.
This debacle is a rerun of the Love Struck deployment.