Thank you so much for your help. In PHPmyadmin I was able to see that the errors were all related to the .jpgs i had set for the Course Summary files. Since "Site Home" and "Edit settings" all call those course summary files, I was getting scary errors on those pages.
The fix was I simply deleted the courses and then re-imported them. Another reminder of how important backups are!
Thank you very much for your help. I gotta bookmark this page so I remember these commands for the future.
Installing and upgrading help
file problem after upgrade - update with debugging
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