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.