Incorrect XML in Firefox / Chrome

I’m getting incorrect XML on loading grid data in Firefox and Chrome. Works OK in IE7. I’m using the PRO version with the full (ie everything in one JS file) script file. The Grid seems to draw itself okay, though strangely the skin doesn’t look the same. Any ideas?

Please, have a look at the following article (here we describe the possible reasons for incorrect xml loading): … rt_comprob