If I use the 5760x1200 resolution, the dragging of the bag frame doesn't work properly.

The position relative to the center screen seems to be calculated by the mouse position by the end of the drag on screen 1. This is however not ideal. The screen order is 1 - 2 - 3 so when I drag on screen 2 (the center screen with all the interface bits) and release on screen 2, the frame will be placed on the proper relative screen pixel position on screen 3. For example: I start dragging anywhere on screen 2 and release the drag on pixel 750x400 of screen 2 the frame will be placed on pixel 750x400 of screen 3. So when I want to place the bag frame on the proper position on my center screen (2) I have to end the drag of the frame on screen 1.

Eyefinity (AMD user) makes it 1 resolution and treats it virtually as 1 big screen, so I'm puzzled as to why the addon seems to make a clear difference between screens.