In the 0.46 when you entered a resolution like 800x600x24 it was a full 800x600.
Since the 0.47 when you determinate a resolution of 800x600 it displays only a 640x480 graphics...
Here, I put the pictures to show what I am talking about...
0.46

0.47 and following versions (including 0.49)

Is there something to add in the config file since the 0.47 ?