These do look important to me: PageSpeed needs to be able to work with
its cache, and it looks like the permissions don't allow that? What
are the permissions on /var/cache/mod_pagespeed/? Are they also
admin/admin?
It looks to me like pagespeed had sufficient permissions to create
some of these files, but now that it's running that's not working. Do
you have something that changes the uid that Apache operates under,
like mod_ruid2? Or did you change permissions recently, maybe by
migrating an existing filesystem to a new server?
I think Q1 and Q2 probably have the same root cause, which is
something fishy about the way permissions are changing over time.
For Q3, it's possible to get bogus directory names in the cache when
bots load your pages with weird Host headers. This shouldn't be a
problem, though, beyond looking messy. How big are those two
directories?
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