Not compatible with TemplateData 

Wikipedia:TemplateData is a brand new feature which is apparently not fully compatible with wikEd:

 Pick a template doc subpage, e.g. Template:Croatian Census 2011/doc.
 Click on Edit.
 Click on the "Manage TemplateData" button.
 Change something in the pop-up form, e.g. the description.
 Click on the "Apply" button".

Now, changes made to template data should be propagated to the edit area ( element), but they are not. The workaround is to switch wikEd off when working with TemplateData form, or to use the edit area directly rather than the form.