Thanks for pointing this out.
I'll forward it to a dev.
As another option to try:
If you set the DPI higher than 96, and you are running Windows Aero (the premium visual experience of Windows Vista), the text and other items on the screen might appear blurry in some programs that are not designed for high–DPI display in this version of Windows. You can avoid this issue by using Windows XP–style DPI scaling for these programs.
Click to open Personalization.
In the left pane, click Adjust font size (DPI). If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
In the DPI Scaling dialog box, click Custom DPI.
Select the Use Windows XP style DPI scaling check box, and then click OK.