Can't upload file greater than 11kb

I've got a situation where I want to upload a file to a server then enter the data in that file into mysql. I have used this well documented upload form <form enctype="multipart/form-data" action="_URL_" method="POST"> Send this file: <input name="userfile" type="file"> <input type="submit" value="Send File"> </form> script on many php servers. However I am on one now which is not allowing me to upload a file greater than 12kb. I know the upload_max_filesize is 2M but something else is stopping the upload and I don't have a clue what it is. I know you should include <input type="hidden" name="MAX_FILE_SIZE" value="30000"> in the above form but that is only a convenience for the user. This particular server is running php as a cgi module. Thanks Chris