You do not have a menu item pointing to the list all Akeeba Ticket System categories for the English (en-GB) language. Ticket links may be broken until you add such a menu item.
#3 – Favicon preview in Little Helper
and thank you for your report. I am not able to reproduce this issue so I'm guessing it may have something to do with your server configuration. The only difference that comes to mind is that the preview images are loaded from the /images/icons folder, and when you press save they are copied to the template. So it may have to do with the /images/icons folder or files being 0700, or maybe some .htaccess restrictions. If you post privately the details about your website (the frontend url will be enough) I'll look into it.