I have just updated NGFB Open Graph to the latest version (5.0) and there's a Warning displayed on top of my admin page saying:
Warning: fopen(/home/mydomain/public_html/wp-content/plugins/nextgen-facebook/cache/0655ac1fee7028dae451cea7f1d6e880.txt) [function.fopen]: failed to open stream: Permission denied in /home/enduacom/public_html/wp-content/plugins/nextgen-facebook/lib/cache.php on line 162
If it try to re-save the plugin settings, the admin page dissapears and there is another Warning:
Warning: Cannot modify header information - headers already sent by (output started at /home/mydomain/public_html/wp-content/plugins/nextgen-facebook/lib/cache.php:162) in /home/enduacom/public_html/wp-includes/pluggable.php on line 876
Any advice would be apreciated :).