Hi everybody,

Working with VS 2005 I found the following strange behavior. Quite often if I open a particular file, I would get an error, such as

Error 1 'filter' is not a known CSS property name. C:\Development\Visual Studio 2005\WebSites\FCAdmin\App_Themes\Profesional\professional.css 200 1 C:\...\FCAdmin\

However, if I close this file, then build or rebuild all succeeds.

Even more strange, sometimes I have errors looking at the page in Source view, but if I switch to Design view and save, then build - I don't have errors anymore.

Do you know why is that and how can I fix the particular error in question (just in case)?

Thanks a lot in advance.