gistfile1.txt

{
	"folders":
	[
		{
			"file_exclude_patterns":
			[
				"sftp-config.json"
			],
			"follow_symlinks": true,
			"path": "/Users/Sean/Dropbox/Sites/Dev"
		}
	]
}

OK, I've just managed to get the error message showing again, and it states:

Error loading syntax file "Packages/Craft-Twig/HTML (Twig).tmLanguage": Unable to open Packages/Craft-Twig/HTML (Twig).tmLanguage

I'm wondering if its down to the fact that the HTML (Twig).tmlanguage file is within a subfolder named Syntaxes within the Craft-Twig folder.

(again these folders are all within the Sublime Text 3>Cache folder.)

Interesting. Try the following snippet in your project file.

{
    "syntax_override": {
        "\\.html$": [ "Craft-Twig", "Syntaxes", "HTML (Twig)" ]
    }
}

I've only just seen your response, apologies!
Just tried this out and it works like a charm, thank you!

Thanks for keeping this gist alive!

I was getting an error with @reywood's snippet, this one worked for me:

{
    "folders":
    [
        {
            "follow_symlinks": true,
            "path": "/Users/viget/Projects/ccusa"
        }
    ],
    "syntax_override":
    {
        "\\.html$": ["Craft-Twig", "Syntaxes", "Craft-Twig"]
    }
}