Have you changed your screen resolution recently?
Very good question. In fact I have just replaced my monitor with a higher resolution screen. However it is all irrelevant now as I have cured it. I uninstalled the old versions of the Converter and installed the latest version 9. All works ok. The hardest part was finding where the DNG Converter had squirreled away on my computer. Eventually found it but I couldn't get access to it through the Control Panel.
Many thanks for your reply
After looking through many threads, I see that this issue dates back quite a few years. For some displays 100% or 200% text size is not acceptable, which will work for dng.. Is anyone aware of a fix for this issue that allows any text size. Pretty dang strange that is still an issue known for a long time by adobe. Is it impossible to run dng converter in all text sizes?