Error 500 while Uploading

Hey Guys,

I’m having a big Problem on my NEW homepage ! When I’m uploading an image in the WP Media Section, it’s unimportant if I’m using the Flash or the HTML Version, I keep getting Error 500. I got to know out of some try’s, that the Problem appears at images bigger than 200KB.

Here’s what I already had tried in the past hours:
– Adding an php.ini in the main WP directory with “memory=20MB”
– Adding an .htaccess file with that two line :

AddType x-mapp-php5 .php
AddHandler x-mapp-php5 .php

– Adding an .htaccess file with these lines:

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

– I called my host service for the php.ini on the Server, they said, the limit for executing scripts is 60 Seconds and the upload file size limit is rated 10MB.
– In the Error.log is this :

84.159.44.102 – – [25/Aug/2011:16:16:07 +0200] “POST /wp-admin/async-upload.php HTTP/1.1” 500 637 “-” “Shockwave Flash”

– I’ve also some other Versions like 2.9.2 or 2.0, but it’s always the same.

I have bought a “myPage” Packet from http://www.1blu.de and they can’t help me at all, they don’t know where’s the problem at all.

Please, if anyone can help me, post me some solution.

Thanks,

Lost Prophet