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This happened to me in Visual Studio 2008 pre and post 2008 sp1 on more than one computer and to someone else I know, so it can't be an isolated incident.
Seemingly random, every so often I lose all syntax highlighting in my aspx page (the html) so that Visual Studio now looks like a really expensive version of notepad.
Does anyone know why does happens? Better yet, anyone know how to fix it?
when this happens to me, i let it sit there for a minute. it will usually bring the syntax highlighting back.