Am I just the last person to notice this?
When you apply a widescreen matte and feather the edges, the feathering looks as if it's premultipled with black or just feathers the image in from the cutoff against black. The alpha is not soft edged as it was in 3, but remains sharp. If you put a color matte underneath, or even switch view to white or something, it looks really stupid.
Nasty, nasty one. Really screws up the effect.
All the best,
Tom