Ответ был найден на портале http://forums.asp.net
"В QUOTING FROM THE BLOG OF From Mikhail Arkipov (AND NOT THE SAME GOES FOR VS 2008)
I blogged earlier that in VS 2005 we switched from using static XML schemas to automatically generating them using reflection on Web controls. XML schemas are generated on demand as you open pages in your Web site. They contain information about ASP.NET controls, custom and user controls. You can find generated files cacheВ in
C:\Documents and Settings\[Username]\Application Data\Microsoft\VisualStudio\8.0\ReflectedSchemas
So, the first thing you want to do if you see dreaded "'asp' is an unrecognized tag prefix or device filter" error is to close all VS instances and then delete the folder contents. Restart VS, open your Web site and we will generate schemas again."
То есть вам в случае подобных сбоев следует очистить содержимое папок
ReflectedSchemas
ReflectedTypeLibs
которые располагаются
1. WindowsXP: C:\Documents and Settings\[Username]\Application Data\Microsoft\VisualStudio\[#.#]
2. Windows7: C:\Users\[Username]\AppData\Roaming\Microsoft\VisualStudio\[#.#]
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