I confirmed my theory about the default tab.
1) The "CodeSnippetContainerLang" cookie is not being set
2) The default of "Visual Basic" is being used
3) If you unzip dev10.mshc, edit branding.js, and set the following on line 13:
var lang = GetCookie("CodeSnippetContainerLang", "C#");
4) Save the ZIP and rebuild your help file
Then C# will be the default-selected tab on code examples.
Like you don't have enough to do, Eric...but can we implement the "CodeSnippetContainerLang" cookie so people don't have to edit a JS file for this feature?
I can create an issue if you want.
FYI and thanks!