Thank you for sending the Formativ configuration. It indicates that you have no Solution Packs installed, which is incorrect (you have installed Message Saver Pack).
I suspect that something has gone wrong during the installation. Could you try reinstalling the Pack? First uninstall it by going to Windows Control Panel -> Add/Remove Programs -> Advansys Formativ Message Saver Pack. Then install again, and try saving messages.
I look forward to hearing of your results.