Issue saving changes in admin area

[shovenose]

I have a problem, a big one!
I have 3 installs of getsimple 3 on my server. One is the latest 3.1.1 and two are 3.1 (3.1.0 i guess?) anyway when I hit the Save button on anything on it, it says "Your changes to EXAMPLE have been saved. Undo" but then after a refresh those changes are not showing up as if I never typed it in! Changes also do not show up on the actual site. I'm using CloudFlare, but enabling Development mode didn't help. I even tried using a different DNS provider (the standard DNS from my registrar) and it didn't help!

My server specs are as follows (I got this from the admin panel of one of the installs of get simple)...

GetSimple Version Upgrade needed to 3.1.1
Download
Server Setup
PHP Version 5.3.6-13ubuntu3.7 - OK
cURL Module Installed - OK
GD Library Installed - OK
ZipArchive Installed - OK
SimpleXML Module Installed - OK
Apache Mod Rewrite Installed - OK

For more information on the required modules, visit the requirements page.
Data File Integrity Check
/data/pages/about-me.xml XML Valid - OK
/data/pages/business-consulting.xml XML Valid - OK
/data/pages/index.xml XML Valid - OK
/data/pages/non-profit.xml XML Valid - OK
/data/pages/schedule-an-appointment.xml XML Valid - OK
/data/pages/therapeutic-consulting.xml XML Valid - OK
/data/other/404.xml XML Valid - OK
/data/other/authorization.xml XML Valid - OK
/data/other/components.xml XML Valid - OK
/data/other/pages.xml XML Valid - OK
/data/other/plugins.xml XML Invalid - Error!
/data/other/website.xml XML Valid - OK
/backups/users/annelisa.xml XML Valid - OK
Directory Permissions
/data/pages/ 0755 Writable - OK
/data/other/ 0755 Writable - OK
/data/other/logs/ 0755 Writable - OK
/data/thumbs/ 0755 Writable - OK
/data/uploads/ 0755 Writable - OK
/data/users/ 0755 Writable - OK
/data/cache/ 0755 Writable - OK
/backups/zip/ 0755 Writable - OK
/backups/pages/ 0755 Writable - OK
/backups/other/ 0755 Writable - OK
/backups/users/ 0755 Writable - OK
.htaccess Existence
/data/ Good 'Deny' file - OK
/data/uploads/ Good 'Allow' file - OK
/data/users/ Missing file - Warning
/data/cache/ Missing file - Warning
/data/thumbs/ Good 'Allow' file - OK
/data/pages/ Missing file - Warning
/plugins/ Good 'Deny' file - OK
/data/other/ Missing file - Warning
/data/other/logs/ Missing file - Warning
/theme/ No file - OK

Thank you very much for any help!