Or did that go away when the custom titles were introduced? I’ll be honest I wasn’t really paying attention. 
My guess would be “at some time when you didn’t renew your membership in a timely manner.”
And no, custom titles and charter membership status aren’t mutually exclusive.
Straight Dope Board Charter Membership 03-24-2004 to 09-17-2009
It’s been a while. Sorry.
If I recall correctly, there was a grace period recently when lapsed charter members could regain their status, but it was for a limited time, and I believe it has now expired.
How did the Charter Member status expire at such an odd time of the year? I know there’s been the occasional “couple of days” extension but this looks like nearly 6 months.
Seconded. I thought all Charter Memberships expire on the same date, which is now 20/5…? (5/20 if you’re American)
I seem to recall some problems with my renewal some time ago. Perhaps that is the reason for the odd expiration date?