Quote from TarybleYou can't "break" MyMedia - if you get it wrong, you just (still) don't have access to the image/font.
You also have to copy the font (or make a symbolic link) into the addon.
Actually for fun once I modified my addon install script to update SharedMedia to have a bunch of links to all the activated fonts on my system. Surprisingly it worked okay until I hit an addon with a font selection dropdown that tried to show all the available fonts. As you can imagine (and as I expected) WoW crashed pretty quickly when trying to do that. Not sure if it was a bug in one of the fonts (not that unusual thing), a bug in the renderer (consider the crash trace I got this is actually a possibility), or just too much memory used (I do have a large number of CJK fonts with variant glyphs and advanced opentype support). I wonder how the WoW renderer would handle something like Studio Lettering.
So yes you can break MyMedia if you try. ;)