I can't see the thread index。

why some thread i open ,but the display area is blank?
then i modified the HTML file's ,it can display. but i can't replay~~!

In the HTML files,i delete this "<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "",it">www.w3.org/.../strict.dtd">",it can display.

why?i'am in China,English is not so well,thanks.

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