Opensuse 11.4 - PHP returned as text?

I'm trying to debug an issue which I think is more to do with Apache than PHP, but perhaps someone else has experience with this. Using opensuse 11.4, custom compile of kernel 2.6.38, custom compile of Apache httpd 2.2.17, and PHP 3.3.6. phpinfo() page works correctly so my httpd.conf is configured to deal with PHP. Using a plain .php file which contains a form with only a submit button, at first the browser loads the .php correctly. Then click submit in the form, and the browser asks me if I want to open or download and save locally the .php file I have requested. This is disturbing since it is potentially a security issue. 1. This only happens with method=POST. method=GET works correctly. 2. Using the same form as an .html file, same failure, so it is not directly connected to PHP. I have posted an issue with Apache (50978) but no response yet. 3. Custom kernel and httpd in Opensuse 11.3 worked correctly. I have posted a question with Opensuse forums but no response. Is anyone successfully using a custom compile of Apache+PHP with Opensuse 11.4?