While responding to a question on ServerFault I noticed that there seems to be a bug in the display code.
Using Bold (
**) and Italic (
*) at the same time shows up correctly as bolded italic text in the preview but on the post itself. The post itself will show up as bolded text with
*'s on both sides.
Perhaps I'm doing something wrong? It explicitly says that it should work in the full format reference on the right side of the page and it does display correctly in the preview. I did not try using underscores.