Single Page not exported preoperly. Get a Page not found error.

[Squelsh]

Hi guys, thanks for your nice plugin. It worked flawlessly for 3 years for me, but then I renamed a page from Multimedia to Videos. Since then it is listed when I rebuild my StaticPress, but the content is only a Not Found Sorry, but you are looking for something that isn't here.

How can I debug, what is going wrong? I already completely deleted the page and created it again, but still the problem remains ): All other pages of my site work without problems.

Thanks for any hints! Andreas