I have sent the session files. This issue is demonstrable at the moment in my station. I check the ignore before box, set today's date, and even though I have made no QSOs since 2/28/21, I have stations marked in WSJTX as seen before.
I am sorry if I offended anyone by asking the question in the forum rather than immediately filing a support contact. It has been my observation and experience that many issues get resolved by someone else in the group who has a quick answer. What else is the forum for? And to restate the obvious, of course I am interested in a solution. Why else would I have posted?
As I have told you previously, I have relied on JTAlert since I set up my station a couple of years ago. And I am pretty sure that I have used the Ignore B4 feature in past contests. So something has changed here.