critic problem with version 1.4.5.1

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Hi there, any help would be apreciated:

 

I was developing our new site with prestashop 1.4.4.1 (we've using version 1.3 with no problems for more than a year now) when I had this problem that I cannot solve .

 

Everything was ok, but suddenly, on a rutinary upload of a csv for the categories, I got a message from chrome

 

Error 324 (net::ERR_EMPTY_RESPONSE): El servidor ha cerrado la conexión sin enviar ningún dato.

 

I tried firefox to see if it was the browser but instead of the error I got a file to download index.php (empty)

 

I have upgraded to version 1.4.4.1. I have installed a new clean version of prestashop on another subdomain but I keep getting this error.

 

My info;

 

 

Información sobre su servidor

Versión de PrestaShop: 1.4.4.1

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Información sobre su servidor: Linux #1 SMP Wed Jul 20 19:47:12 MSD 2011 x86_64

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Versión del software servidor: Apache/2.2.3 (CentOS)

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Versión de PHP: 5.1.6

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Versión de MySQL: 5.0.77

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I have checked everything from mysql log to apache error log but nothing shows.

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PLEASE HELP ME, we need to put the new version of the site inmediatly.

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thank you in advance

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