Thank you Mark and thank you Connie!  Noting that the enabled repo is 
not the file name but the name in the square brackets solved my problem 
and ended up being the solution to my updating.
Paul
On 12/19/2013 03:31 PM, Mark Stodola wrote:
> Do you have any other repo files for sl-fastbugs?  If so, change the 
> [sl-fastbugs] at the top of your sl-6.4-fastbugs.repo file to 
> something else, such as [sl-fastbugs-6.4].  Yum is seeing multiple 
> files with [sl-fastbugs] in it, regardless of the enable/disablerepo 
> options.  The enablerepo should use the string between the [], not the 
> filename.
>
> -Mark
>