If you are missing
That means there are no custom fields registered for lists(if I send you the configuration files for lists module with custom fields there might be a bigger problem or no result at all). Seeing you can`t access the settings for lists I am not sure what might have caused this. I have some suggestions please test them on a separate project.
Remove all the assemblies in the bin folder and replace them with the assemblies from a blank project from the same Sitefinity version.
If this doesn`t help can you open a support ticket and send me the project files and a backup of the database so I can inspect the issue in more detail at my end? If the files are too big to attach to the ticket please upload them to FTP and provide me with credentials.
If in some case sending files is not possible can you give me temporary backend access to the site to inspect further?
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