New Post: troubleshooting issue with SPServices / creating new list item

Hi Everyone:

I am trying to troubleshoot and could use some help.
I am using the library to submit new items to a list, from an HTML form.
It's working for me, but not for my end users.

The list has contribute permissions for all authenticated users, and the parent site has read permissions for all authenticated users.

i've tried adding the user to a group, and giving that group Contribute permissions. No luck.

One thing I notice when I submit using this form is I get an informational alert "This page is accessing information that is not under its control. This poses a security risk. Do you want to continue?" I hit yes, and the code works (it submits to the list). Other users don't see this alert when they submit.

Could this be the issue?

thanks,
Harry