UPDATE: The "live" update to 5.11.3 worked without a hitch.

Thanks!

That worked! Thanks!

Your assessment is correct, but if the solution is not clear, then I think we should leave it as-is and I'll update manually. But thanks for the offer.

Thanks for the reference. Yes, I had Windows set to combine when full. But in order to get everything to work after the mysterious error message, I had to uninstall 7+TT completely, including its settings, then reinstall. After changing the Windows setting to never combine, I was able to get the sticky notes combined using the Taskbar Inspector.

I tried to recreate the error message and was unable to do so.