6.1.1 CE GA2, 6.1.30 EE GA3, 6.1.X EE, 6.2.1 CE GA2, 6.2.10 EE GA1, 6.2.X EE, 7.0.0 M3
1. Add a portlet to the page
2. Change the portlet's title to "Hello <b>World</b>" (without the quotes)
If you refresh the page, the title will appear correctly. However, a page refresh shouldn't be necessary.