Problems when updating to PHP 4.2.3 and Apache 2.043 - variables are ignored

Hi there, I´ve updated my local testing system on windows 2000 to php 4.2.3 and Apache 2.043 Everything seems to work proper, until one big problem: When I'm accessing a php-site, (f.e. tinypr/opelhauser/index.php) the script ist parsed propperly and the site is shown correct. Whenever now a variable is delivered to the same script (f.e. tinypr/opelhauser/index.php?todo=1) this variable is not used by php, so that the page is shown again without using the variable value. Is this problem known by anyone and is there a fast and simple solution ? With the earlier combination (PHP 4.2.2. and Apache 2.039) this all have worked propperly! Thanks in advance, Axel