There is a code syntax highlighting problem which had been fixed a long time ago, but for the last couple of weeks appears again. Usually it would automatically detect that the code sample is VB.NET (because of
vb.net tag I think) and format it properly. In the last weeks I have to add the markup
<!-- language-all: lang-vb --> for my code samples to display properly.
For example, if you look at my answer from this question you can see that code is highlighted properly, because I added the markup tag to specify that the language is VB. But if you remove the hint, then it doesn't recognize VB (comments aren't displayed properly).