Apparently the hack produces invalid stats if MYSQL is compiled in a non-english language. This happens because MYSQL can be configured to use different 'lang_decimalsep' and 'lang_thousandsep' variable values which bothers the number formating through vb_number_format() function.
To fix it, I suggest to find:
PHP Code:
$totaltime = vb_number_format($endtime[0] - $starttime[0] + $endtime[1] - $starttime[1], $msdecimal);
in the hack code inside functions.php
and BEFORE that add:
PHP Code:
$bbuserinfo['lang_decimalsep']='.'; $bbuserinfo['lang_thousandsep']=',';
This fix forces to use English seperators which the hack code depends so regardless of MYSQL configuration the formatting works fine.