Why? Because you are running a Circus
I noticed the following from your repos :-
- You have enabled ATRPMS a bleeding edge repo known to cause problems even in the fedora world. Talk to the ATRPM people about your problems. - Nobody uses dag repo by itself, they use rpmforge (dag and dries and so on). In addition to that the new rpmforge allows the use of mirrors rather than hammering dag's resources. Don't abuse dag's generosity. - You have enabled automatic yum updates so you cannot keep track of changes or say yes or no. - You are not using the yum plugins which protect base from being overwritten by 3rd party repos. See the yum docs updated recently by Johhny. A testing server of mine has 280 packages protected by the yum plugins. No guessing what will happen when you want to install update 4 and you have hundreds of core files updated in base.
See this recent post where someone has ATRPMS and ATRPMS testing and comes complaining to us. He had not even applied the 3.7 updates. http://lists.centos.org/pipermail/centos/2006-April/063992.html
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