Materialized view log not updating
And the answer is, operator ineptitude :-)

Apparently, when the change is applied to the MV, the log entry gets purged. The update shows up in the MV. The reason I was looking in the log at all is that this MV is used to update another MV, and the change was not showing up there. That view has it's own issues which I will have to work out.  Thanks for looking!