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There is a long story. You hear about problem with smarty "debugging". It's because in depth yii code renderPartial and render always set $return to "true". And always we have fetch() (not display()). And then always a debug window doesn't render.
If we call renderFile() — ok, we have debug window worked well, and smarty understand path like a "blog/index.tpl", but old code don't.
There is templateExists() — core Smarty function, included in both versions.