Hi Martin,
"yum downgrade libxcb"
or
"yum distro-sync"
Both assume that the newer libxcb really isn't offered in the fschwarz
repo anymore (or that you disable that repo), or else it would be pulled
in as an upgrade again next time you run yum update.
Thanks a lot, distro-sync solved the problem. Downgrade itself
complained about packages not available any longer.
Glad everything is in order now again.
Thanks again and best regards, Clemens