You do not have sufficient permissions to access this page.

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If you haven’t already solved this issue. Is your login page redirecting you from /wp-admin/ to /login?

Nick: I have this exact problem and I am doing redirecting from /wp-admin/ to /login.

Is there any solution to this problem?

This seems to only happen when using the page menu. If the left navigation is used, then everything works fine, I think.

I have exactly the same problem, with the added complication that I am using a theme from Clickbump – and this plugin hides the Clickbank icon in the WP dashboard, so that it cannot be accessed/modified.
Deactivating the plugin restores the icon to the WP dashboard, so there is little doubt where the problem lies.
I’m using the latest version of the plugin 3.4.6 – which I have now deactivated.

I spent a few hours on Saturday cleaning up this problem on one of my multisite installations. I still haven’t tracked down the culprit.

My issue was the [WPDB_PREFIX]_[SITENO]_user_roles database entry in the [WPDB_PREFIX]_[SITENO]_options table was nearly empty. In the options table, there was a wp_[SITENO]_user_roles entry. I was able to copy this entry using phpMyAdmin into the correct field and it resolved my problems.

[OPEN]
wp-config.php

[FIND]
define( 'DISALLOW_FILE_EDIT', true );

[REPLACE]
#define( 'DISALLOW_FILE_EDIT', true );

I have the same “You do not have sufficient permissions to access this page” problem, but the differences are:
1. I can’t even log in to the dashboard
2. I could login normally yesterday

The only thing I could try is erasing the “wp better security” (that seems to have caused this issue to many others) via my ftp, but still nothing.
I tried to do the chance YossarianC suggested, but my ftp won’t let me save or replace my wp-conflig.php file.
Could anyone help???

Thanks!