First of all - turn on debugging and see if you get any template loading related error messages. You also need to make sure that the override for the section is placed above any other overrides for the same templates in override.ini, ie:
If you have them the other way around, the article_full override will take presedence. The last thing you need to do is clear out your ini cache - overrides are not reloaded if the ini settings are cached.
It will only affect overrides to the full.tpl template for the article class in the section you specify. If an article is to be viewed in full mode and it is not in the specified section, eZ will look further down the list.
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