Have you changed the monitor resolution or the font sizes in Control Panel-Display lately? This sounds like a video card problem-perhaps too little memory?
Check out the UFT Knowledge Base (Link is given above). Also refer Troubleshooting in UFT Help. The following is pasted from that section.
"You can also change the font size in Ultimate Family Tree by editing the PD.INI file found in the UFT directory (or whatever directory you installed Ultimate Family Tree).Add the following lines (or edit if they already exist):