[Fri Dec 7 18:50:08 2007] [error] [client 66.211.170.66] File does not exist: /home/bryony74/public_html/500.shtml
[Fri Dec 7 18:50:08 2007] [error] [client 66.211.170.66] Premature end of script headers: /home/bryony74/public_html/ipn_main_handler.php
SoftException in Application.cpp:231: File "/home/bryony74/public_html/ipn_main_handler.php" is writeable by group
[Fri Dec 7 18:41:59 2007] [error] [client 85.210.49.181] File does not exist: /home/bryony74/public_html/500.shtml
[Fri Dec 7 18:41:59 2007] [error] [client 85.210.49.181] Premature end of script headers: /home/bryony74/public_html/ipn_main_handler.php
SoftException in Application.cpp:231: File "/home/bryony74/public_html/ipn_main_handler.php" is writeable by group

I'm not really sure what to make of this - it all looks a bit jumbled to me!