phpMyAdmin in the Plesk control panel complains about the version mismatch:
Other forum posts suggest this should not be an issue. Certainly, no dependencies failed as a result of the yum upgrade.Your PHP MySQL library version 5.0.90 differs from your MySQL server version 5.1.48. This may cause unpredictable behavior.
Still, phpinfo() reports the client API library version is 5.0.90; so, no PHP application, including Plesk's phpMyAdmin, will be able to access any new features?