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Have you opened the SELinux troubleshooter? CentOS is not Ubuntu, there is a lot of permissions to add for an app to get stable. But Qt 4.1 is old, it was probably the problem. CentOS is more stable than Ubuntu, but you have to think CentOS/RedHat to have something working. At first, it will just crash with lack of permissions on the various security framework.
But once it run, it will run for a long time.