Uploading fails to HTTP Error or login screen with files over 8MB.

So. I’m using WordPress 2.8.3.

I have red trough all the threads I could find about this error, but the problem remains.

When I upload files < 8MB, the uploaders work ok. With bigger ones they fail. With Chrome / FF login screen pops up when the “crunching” begins. With IE I get the HTTP Error.

Here is what I’ve tried to correct this:

1. First WP told me that there wasn’t enough memory -> I fixed the htaccess with following:

php_value upload_max_filesize 81388608
php_value post_max_size 81388608
php_value max_execution_time 1500
php_value max_input_time 1500
php_value memory_limit 81388608

2. I also added the

<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>

3. I checked with phpinfo, that all the values are changed.

4. I checked the upload paths at wp, it is wp-content/uploads.

5. I added define('WP_MEMORY_LIMIT', '60MB'); to wp-config

Nothing helps, and this should be ready this week – any ideas?

Thanks!