To add:
Fri Jan 24 03:47:25 2014] [error] [client 66.249.84.116] client denied by server configuration: /home/jeroepr54/domains/goedinjevel.eu/public_html/wp-content/themes/mantra/js/PIE/PIE.php
[Fri Jan 24 10:54:36 2014] [error] [client 82.174.122.57] SoftException in Application.cpp:249: File "/home/jeroepr54/domains/goedinjevel.eu/public_html/wp-admin/post.php" is writeable by group, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 10:54:36 2014] [error] [client 82.174.122.57] Premature end of script headers: post.php, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 10:55:14 2014] [error] [client 82.174.122.57] SoftException in Application.cpp:249: File "/home/jeroepr54/domains/goedinjevel.eu/public_html/wp-admin/post.php" is writeable by group, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 10:55:14 2014] [error] [client 82.174.122.57] Premature end of script headers: post.php, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 10:55:33 2014] [error] [client 82.174.122.57] SoftException in Application.cpp:249: File "/home/jeroepr54/domains/goedinjevel.eu/public_html/wp-admin/post.php" is writeable by group, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 10:55:33 2014] [error] [client 82.174.122.57] Premature end of script headers: post.php, referer: xxxx/wp-admin/post-new.php
[Fri Jan 24 11:01:32 2014] [error] [client 82.174.122.57] SoftException in Application.cpp:249: File "xxx/wp-admin/post.php" is writeable by group, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 11:01:32 2014] [error] [client 82.174.122.57] Premature end of script headers: post.php, referer: xxxxx/wp-admin/post-new.php
[Fri Jan 24 11:06:31 2014] [error] [client 82.174.122.57] SoftException in Application.cpp:249: File "xxxx/wp-admin/post.php" is writeable by group, referer: https://goedinjevel.eu/wp-admin/post-new.php
[Fri Jan 24 11:06:31 2014] [error] [client 82.174.122.57] Premature end of script headers: post.php, referer: xxxx/wp-admin/post-new.php
[Moderator Note: Please post log files between backticks or use the code button.]