I suggest restoring your backup to the last known working version.
Don't upgrade the operating system until you can afford to upgrade to a newer version of Toast, or can verify that this version of Toast you have has the capabilities you need under the new operating system.
Upgrading should only be done with you are sure that everything you need is able to be upgraded smoothly, including third party software and peripherals. That's part of what my Upgrade FAQ explains:
http://www.macmaps.com/upgradefaq.html
Disclaimer: Reference to links I make to my Macmaps.com website are a for your information only type reference. I do not get any profit from this page, and it is open to the public.