Sir, what I can tell you is that before the update, my signups were not deleted–even from events I had in January. After the update, all my signups are gone, even for previous events.
I did have that box unchecked, clearly it re-checked itself upon updating. I agree–would be nice if the settings we have do not get re-set upon updating, or at least if the default settings are to keep information rather than delete it.