I found this topic of yours just now. I noticed that all your post regarding Frontier theme are not posted on the theme's dedicated sub-forum and instead you've just manually prefixed your topic titles with "[Theme: Frontier]". This method does not notify the author.
Some theme authors do occasionally browse the Themes & Templates forum but some are just not able to, which is understandable considering the amount of topics that are being created. It's hard to keep track. At the very least, an author might consistently check his or her theme's sub-forum which is found on each theme's page.
But as Alchymyth mentioned, with a volunteer-based forum, there is never any guarantee that topics will be resolved.