Reader glitchy on Safari 7.0
I am having some trouble with the Reader function on Safari 7.0
Reader will occasionally work, whilst it sometimes does not on the same article.
On launching a website and clicking onto an article, I will click on the Reader icon and Reader will appear, as per normal. On entering another article, the Reader icon becomes available (ie is blue), and on selecting it the Reader page does not appear, despite the Read icon indicating it had been launched. I can continue to scroll up and down the page, and despite clicking on the Reader icon multiple times, Reader does not appear.
Closing the tab, reopening the same article and clicking the Reader icon launches the Reader, however the issue persits when I try another article.
Refreshing the page does not resolve the issue.
I have tested on multiple sites, and I understand that some pages with limited text will not allow for Reader to display, however I am sure that is not the issue.
Just recently updated to Mavericks 10.9 from Snow Leopard 10.7.8. All updates for Safari and Mavericks have been installed.
I have never had this issue before.
MacBook Pro, OS X Mavericks (10.9)