Can't download extensions via the UI

Downloading extensions via the UI is broken in Civi 4.6. I can still install extensions on 4.5 installs, and this person[1] reported success installing on 4.4 after experiencing this issue, so I assume the problem is in code, not the extension infrastructure.

I replicated this on two Drupal sites w/ Civi 4.6.3, and a Wordpress site with 4.6.2, and on a 4.6 civicrm-buildkit install. I couldn't find any 4.6 installs that didn't exhibit this behavior, so it's a good bet this affects all 4.6.x installs.

To replicate:

• Just click "Download" on any extension from the "Add New" tab of the "Manage Extensions" page.

Backtrace follows:
CRM_Extension_Exception_MissingException: Unknown extension: com.aghstrategies.civimonitor in /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Extension/Container/Collection.php on line 106
Exception trace

1. Function Location
   0 CRM_Extension_Container_Collection->getContainer('com.aghstrategie…') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Extension/Container/Collection.php:106
   1 CRM_Extension_Container_Collection->getPath('com.aghstrategie…') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Extension/Mapper.php:188
   2 CRM_Extension_Mapper->keyToInfo('com.aghstrategie…') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Admin/Form/Extensions.php:104
   3 CRM_Admin_Form_Extensions->buildQuickForm() /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Form.php:476
   4 CRM_Core_Form->buildForm() /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/QuickForm/Action/Display.php:94
   5 CRM_Core_QuickForm_Action_Display->perform(Object(CRM_Admin_Form_Extensions), 'display') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/packages/HTML/QuickForm/Controller.php:203
   6 HTML_QuickForm_Controller->handle(Object(CRM_Admin_Form_Extensions), 'display') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/packages/HTML/QuickForm/Page.php:103
   7 HTML_QuickForm_Page->handle('display') /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Controller.php:353
   8 CRM_Core_Controller->run() /var/www/database.aclusandiego.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Page/Basic.php:395
   9 CRM_Core_Page_Basic->edit(2, null) /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Page/Basic.php:174
   10 CRM_Core_Page_Basic->run() /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Admin/Page/Extensions.php:125
   11 CRM_Admin_Page_Extensions->run(Array, null) /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:312
   12 CRM_Core_Invoke::runItem(Array) /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:86
   13 CRM_Core_Invoke::_invoke(Array) /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm/CRM/Core/Invoke.php:54
   14 CRM_Core_Invoke::invoke(Array) /var/www/database.mysite.org/wp-content/plugins/civicrm/civicrm.php:1133
   15 CiviCRM_For_WordPress->invoke('') unknown:unknown
   16 call_user_func_array(Array, Array) /var/www/database.mysite.org/wp-includes/plugin.php:496
   17 do_action('toplevel_page_Ci…') /var/www/database.mysite.org/wp-admin/admin.php:226
   18 {main}

   
   Sorry but we are not able to provide this at the moment.
   Unknown extension: com.aghstrategies.civimonitor

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[1] http://civicrm.stackexchange.com/questions/2048/cannot-install-extensions-on-a-wordpresscivicrm-install