Steps to reproduce:

1. Create a new Confluence page
2. In the edit form, add the invalid label: 'del.icio.us'
3. Save the page

Expected outcome:

  The validation error for the labels should be visible

Actual outcome:

  The validation error for the labels is inside a hidden div, and only visible if you look for it. Otherwise there is no indication of why (or even if) the save failed.