I'm having a very similar problem.

The program I'm installing says to do this:

PHP 4.3.10 or higher with the following set in php.ini file:
-The max_input_time directive set to a value of at least 30
-The post_max_size and upload_max_file size directives set to the size of the largest attachments yu wish to be able to upload.
-The memory_limit directive set to at least 8M
-The max_execution_t ime...