Thanks for the answer to yesterday's yum problem, removing squid solved
it. But now since today's 40rolling update I get:

Transaction Check Error:   file /usr/share/anaconda/pixmaps/monitor.png
conflicts between attempted installs of redhat-logos-1.1.25-1.SL.4 and
anaconda-10.1.1.13-5SL

This does seem to raise two issues:

* Does yum have a "graceful degradation" option? I can't find one.

* Are the rolling releases tested for clashes?

John