Drop Shadow only in pixels?

I try do do a simple drop shadow (no transparency, no blur) with CorelDraw X6, but recently it only creates very ugly pixels and not a fine vector. See the settings for the shadow on my screenshots. The major problem is that i get the pixels also when i export the document to any other format (pdf, jpg).


I've tried to change the resolution of the document from 300 dpi to 2400 dpi, that helps a bit but could not be the solution to this problem!?
I've started CorelDraw X6 with holding F8 key and resetted all Options, that didn't helped at all
What am I doing wrong?

The drop shadow with standard document settings

This Image is with a document resolution of 2400 dpi

This image shows the settings of the document i've changed from 300 dpi to 2400 dpi

This Image show the standard settings with the pixel problem!