Kevin & Dan, thanks for taking a look ‘under the hood.’ Unfortunately there’s no solution. We’ve been working with our server staff, who’ve helped debug some, but we still haven’t found a solution.
One thought: Our server staff have cracked down on files and directories with ‘777’ permissions. Could there be specific files or directories that, when changed to 775, would prevent new Templates from being created?
We also have a test instance on the same server in a different directory that is still functioning properly. We’re evaluating each extension, module, plugin, config, htaccess, and path file, looking for differences. So far we haven’t found anything. I’ll post here when we do. In the meantime, let me know what you think about the 777/775 differences as they relate to New Templates. Thanks!