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I encountered an HTML 5 related issue in the W3C validator; before reporting it I have tried to reproduce it with Validator.nu but that is working fine. The validator is checking a page correctly first time, but on editing and reloading the page it persists in using the old page source (as shown if tick box for "Show Source". The error does not occur in validator.nu, where the pages are being updated correctly. This is not restricted to a single page.
Created attachment 1560 [details] screenshots of w3c and validator
Created attachment 1561 [details] screenshots of w3c and validator