Thanks for those reminders. I have in fact checked to ensure that the permissions are correct. The process running inserts is owned by www-data.

I have tested an insert both by hand and via phpLiteAdmin to ensure the database can take inserts as well.

Again, thanks for the reminders.

Update:I was wrong. Permissions/ownership on the files under /var/www were correct, however permissions on the directories themselves were incorrect. Such a basic mistake to make! Ah well, doing things under the light of midnight oil is my excuse... .

Thanks again for the help!