Let me try to clarify.
The flat waveset is a incorrect waveset. If you make your waveset flat, it's wrong and will not look right and will be buggy and break things. It'll flicker, it'll disappear; it's a incorrect use (just like trying to start your computer with it no plugged in). So, if you're going to use wavesets, I suggest you use them correctly rather than incorrectly--just because something crazy works once, doesn't mean it works.
Cyan made wavesets to be flattened to the bottom of the sea, that's the way it's done.
*me stops ranting*
I don't mean to get down on you flat-wavesetters... really, I just hate to see buggy ages that could be prevented.
Currently getting some ink on my hands over at the Guild Of Ink-Makers (PyPRP2).