Sorry Herbert. No, there is nothing offending in your post. We all are just a bit busy with the upcoming Moodle 2.2 release so I missed your question somehow.
The issue you describe is a known problem in Workshop 2.x and has already been reported as MDL-27508. Please vote for that issue to increase its chance to get the attention during the next development cycle.
Workshop
(non-editing) teacher - group view
This discussion has been locked so you can no longer reply to it.