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I have an issue with the new custom menu in WP3. Suddenly the nesting of categories stopped working and even though it's possible to nest them in the UI, when I press Save, then they all go back flat. Any chance someone has experienced this and know a way to fix it? Thanks.

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up vote 1 down vote accepted

First, try disabling all of your plugins. If that fixes it, re-enable them one by one until you find the culprit.

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