I can't reproduce this error. Just to be sure, you created a new raid (via putting the raid name in the text field on the left under the drop-down menu) first, THEN input some data into the raid/subs fields, then click Update or Save. Either of them should work. Remember that if you create a new raid, then hit save it will not save it, since there are no members to save to that raid. Saving an empty raid just seems silly to me. :P