If you uploaded the 'class_core.php' file it should be working fine.
Try rebuild the Versions cache.
Edit: I should quote people next time, now I look like a fool.
Someone posted that they were getting that they were getting "You are running version 1.2.3 you are not running the newest..." you get the point. ^_^
Try rebuild the Versions cache.

Edit: I should quote people next time, now I look like a fool.
Someone posted that they were getting that they were getting "You are running version 1.2.3 you are not running the newest..." you get the point. ^_^