Solving the Authentication and Plugin Errors After an Upgrade to WordPress 2.5

March 31st • 11 Comments • Under: WordPress • Tags: plugins, WordPress

The upgrade process to WordPress 2.5 was as smooth as it can possibly be — simple, fast and without a single error message. However, there were a few problems that became apparent only after the upgrade. This article will explain those issues in detail and show how to solve them. Here is a short list of problems solved:

1. When trying to log-in after the upgrade, the following error message is displayed: “You do not have sufficient permissions to access this page.”
2. Yet Another Related Posts plugin returns “Fatal error: Call to undefined function merge_filters() in … includes.php on line 73”.
3. Popularity Contest plugin returns “Plugin could not be activated because it triggered a fatal error” when reactivated.

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