I was a member of the groups in question.
Before the great update, I would see most of my posts in a few seconds,
at most 5 minutes. Now Yahoo gives no errors, and just returns to the
openening page, with no
visible messages. It takes up to 7 atempts before it is accepted, and
then I
am returned to the home screen, again with out messages.
When I enter the group the same thing, home page with no messages.
And it isn't only me, several friends, in widely diverse groups have
the same error.

If they ever resolve this improvement, I can always join again. For the
time
being I will spend my time in more productive ways then fighting broken
software.

Terry