Re: Fade plugin usage
This is a known problem. See Bug & Wish list item 4217: Limited number of single nested plugins, which should not be limited.
If you edit: /lib/core/WikiParser/PluginMatcher.php, and increase the number of passes from 500 to 800, then your FADE example with the 7 levels will work.
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if (++$passes > 800) { return; }
But that is not permanent fix. It will increase the number of nested FADE plugins you can have, but the number is still limited.
Tom