I'm having an odd issue in the administration side.
On Settings page, the Company page will not save the data. When you click on save, it goes to a 404 error page.
All the other settings pages work fine, for example General, Appearance, Stores, etc... All those work fine with the ajax firing and returning a successful save message.
I looked at the code for Settings:Company and compared it to the other pages, but I don't see anything missing.
Could it be a permission issue or maybe the section_id for Company is not being found?
Suggest you click on the admintiles.php line and look at the request/response.
Also suggest you enable the console window so you can see any JS errors that may have occured as well as review your PHP error_log files for any errors.
Have you tried using lower case for your section name? I.e. 'company'