I am concerned about ... "/includes/class_core.php".
1. ) Maybe you have some weird modification that modifies this core file "class_core.php", but it should contain expected results. You need to investigate this file and/or update with a fresh copy from the vbulletin release files.
2. ) Disable hooks/plugins
3. ) Select the default vbulletin style, so you are using the default templates.
Have you modified the master style?
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