Not specifically, but this appears to be a font problem and a graphics driver issue.
The client is .NET based. If you try the web based client does it show the same thing?
Maybe you are running the client in some Windows compatibility mode or have Aero disabled.. some apps will change to a 16 bit mode to avoid (because of Windows settings) normal depth. I did this for a few of my desktop apps, and I depends on the application if it supports certain modes.
It is defined by the graphics card driver.