PROBLEM Unable to add photos or links to new pages / unable to update old pages

[laforestk]

Hi everybody,

I'm new here, I recently became the admin of a website that uses GetSimple CMS and it seems to have some bugs:

1- When I create a new page, it works if it's only text, but it bugs if I add a photo or an URL link. 

2- On old pages, I'm unable to update them at all if they include photos or URL links.

Here is the error page I get in both cases:

Oops! Page not found!

We are sorry, but the page you are looking for does not exist.

***

NOTE: This only happens for "pages". When I post "news" with photos and whatnot, it works.

If it helps, here are my plugins:

News Manager (updated)
A blog/news plugin for GetSimple
Version 3.4.1 — Author: Rogier Koppejan, Carlos Navarro

Multi User
Adds Multi-User Management - Edit all options for current users and manage permissions.
Version 1.8.2 — Author: Mike Henken

***

Thanks for any help!