Database problem?

Hi.

I just noticed something very (!) strange! I have 2 WP sites on the same server (databases are also on that server). The first WP site I am using for testing purpose (WPtest), and when all is ready, I copy/paste the stuff to the second WP site (WPpublic).

Now … I just realized that a paricular post I did 2 years ago can’t be displayd anymore on WPpublic. I get this message:

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@mysite.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Now … WPtest has the same problem!

However when I login to my account at http://wordpress.com, I can see this particlar post.

How is all this possible?

A database problem?

Thanks,