Carlo,
did you check all entries in your override.ini.append file? I exeperienced your same error when I wrote wrong entries: I was wrong in the subdir entry (the template file have to be saved in the design/mydesign/overrider/template folder and the Subdir entry must be "templates".
I'm sure you already deeply checked this, but it's only a try...
I resolved my problems: there is a possible bug on local cache, that it's delete by admin section. Every time I modify an override, I must delete it manually, else file .ini are not reloaded automatically.
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