Hi.
Export to PNG with is a great and useful feature, but sometimes there is a problem with antialiasing. I can't find out the cause of such problem.
Usually I export to PNG a multylayered scene to collect layers in Photoshop and I save each layer to different file with alpha. Usually it works great, but sometimes layers export with sharp edges. Some files export successful, other with that problem in some layers.

Changing antialiasing option in export dialog does't solve the problem. What I do wrong?