[base.inc]: "Illegal string offset 'format' in views_object->unpack_translatable()"

Every time I save a view (field settings, header text, etc):

Warning: Illegal string offset 'format' in views_object->unpack_translatable()
(line 330 of [local path] \www\sites\all\modules\views\includes\base.inc).

Line 330:

      if (isset($definition['format_key']) && isset($storage[$definition['format_key']])) {

The view seems to be saved correctly, but it reliably generates this warning.

Drupal: 7.14
Views: 7.x-3.3
PHP: 5.4.0
Windows 7

Thanks for any suggestions!