I have the same problem with the bottom 4 buttons of DNG converter missing and also the font in the "Synchronize" pannel when opening more than one image in Camera Raw is split. Half of the tops and half of the bottoms are missing.
I am using Windows XP and have the font set at Normal. Only other font size options are Large and Extra large.
Screen resolution is 1920x1080, and running CS5.
Apparently in Win XP the only font size options that I have are "Normal" "Large" and "Extra Large" at laest that I can find.I am using "Normal" and still have the problem. Also the text in step 1and 2 of DNG converter next to the boxes to put a check have the top and bottom of the text cut off.
I have gone through the steps in the recommended link to no avail. The link solution deals with Win 7. I have Win XP