Amir J. Katz writes:
set-window-buffer(#<window on "INBOX" 0x8a31>
#<buffer "INBOX">)
This seems to be a recurring theme. I'm also seeing at least one
other weird recentering display behavior that makes me think
something bad has happened to the redisplay. If anyone knows of
recent redisplay code changes that might be responsible, please
speak up.