I donât know if itâs related or not, but on the frontend, I can see the home page and catalog pages, but links to product pages give me a 404 error.
For that try to re-index and clear cache.
Fatal error: Call to a member function getInputType() on a non-object in /home/pennysbo/public_html/app/code/core/Mage/Catalog/Model/Product.php on line 995
Concerning that error, I offer you to check the same file in default Magento and see what differs from the current file you have. Also check the line 995, maybe you will find there what exactly is not executed and it might give direction to the solution.
While you are looking for the solution, I offer alternative means to manage you catalog, add and edit your products - the application called Store Manager for Magento. There is 2-week free version of the application (link and details is in my signature), so you will be able to manage your store and in meanwhile I hope that you will be able to fix the issue.