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For both Twenty Twelve 1.1 and a child theme based on Twenty Twelve, widgets cannot be added.

If I go to appearance > widgets, there is no widget area to drag widgets into.

I have reinstalled the latest Twenty Twelve theme, and switched to it, but the issue remains.

Wordpress v3.5.1

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this sometimes happens when there's an error in the code of a widget, are you adding your own custom widgets via the theme or a plugin? –  Milo Jan 31 '13 at 2:56
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Have you ruled out plugin interference? –  brasofilo Jan 31 '13 at 3:09
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Disable all your plugins (yes really, all of them) and see if the problem persists. Then one by one enable the plugins and see on which plugin do your widgets disappear. –  Vincent P Jan 31 '13 at 4:35
    
Thanks. The offending plugin was "Portfolio posts loader". –  Steve Jan 31 '13 at 5:47
    
@Vincent Add an answer and I will select it. –  Steve Feb 1 '13 at 3:55
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1 Answer

up vote 0 down vote accepted

Your most likely having an issue with the plugins. These types of problems are extremely hard to diagnose. I had a similar problem with the Wordpress theme Arjuna-X where it was loading it's own modified JQuery library that was only breaking the switching of "Visual" and "HTML" in the post editor. Took me days to figure out.

Essentially go to Plugins in your wordpress admin. Then next to the word "Plugins" there is a little check box that when clicked will select all your plugins. Then use the drop down to select the "Deactivate" option. Then click Apply.

Now go check if the problem is still there. If it is then I'd suggest re-installing the theme (I know you did already, I'm just putting it here for reference). But maybe also try replacing the physical theme directory, not just re-installing the them from within Wordpress

Then one by one enable each plugin and take note of which plugin breaks the widgets section. Once you found the plugin, just search the internet for that plugin name, something like "[plugin name] breaks widgets area". Also you might as well email the author of the plugin or check to see if the author has a temporary fix. It could be as simple as a setting or you might have to leave that plugin deactivated until the author fixes the problem. Tell us if you come right and what plugin was the issue.

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