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The default view that this module provides needs to be resaved and exported.
Here is the problem line of code:
http://cgit.drupalcode.org/workbench_moderation/tree/views/workbench_mod...
$handler->display->display_options['empty']['area']['format'] = '1';
Should probably be:
$handler->display->display_options['empty']['area']['format'] = 'plain_text';
That way the text format is referenced by name instead of an integer.
This will probably help to prevent "Missing text format: " errors that are displayed in the Drupal logs.