consists of thousands of records in errorlog.txt.

[herkadin]

consists of thousands of records in errorlog.txt. file size increases up to 10GB

This error :

[30-Sep-2010 02:58:30] PHP Warning:  htmlentities() [function.htmlentities]: Invalid multibyte sequence in argument in /home/********/public_html/classes/Tools.php on line 657

(version 1.2.6) Tools.php on line 657 :
(version 1.3.1) Tools.php on line 717 :

$entity = htmlentities($char, ENT_COMPAT, 'UTF-8');

Thank you in advance for your help

[rocky]

It's a bug that has been reported a few times now. It seems to happen only on IIS, not on Apache. The PrestaShop team said in one of those bug reports that they will look into issues with IIS in the next version of PrestaShop.