Context is not set for menu_block

Components:
-Drupal 7.56
-Menu block 7.x-2.7
-Context 7.x-3.7
-Context menu block 7.x-3.1-beta3+0-dev

I am experiencing an issue with the context_menu_block module where menu blocks are not informed of the page context.

I have done some debugging, and I have found the issue but have not been able to correct it.

function _context_menu_block_active_values($context_name) {
  $contexts = context_get();
  $active_values = array();
  // If there aren't any contexts available, then there aren't any active values.
  if (empty($contexts['context'])) {
    return $active_values;
  }
...

context_get always returns an empty array, which leads me to believe that this function is running before the context triggers have been triggered.