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Somehow my VS2008 SP1 has lost the ability to step into .NET framework sources. I've played around with checkboxes to no end; I've re-deleted the Symbol cache folder a dozen times; and I've tried all kinds of debug symbol servers.
All it does is download some .PDB files, but when I try to select a stack frame in .NET, I always get the message about no source available and "do you want to view disassembly".
What gives?
Added: Web application; Windows Vista Business x32; .NET 3.5 SP1.
I've noticed that if this issue occurs when you're running a website, enabling HTTP keep-alives in IIS can fix it.