Hi Bruce,
Yes you can just switch to the Ray Tracer to get rid of the blurriness in your texture maps, however you can also do this with the Open GL renderer. What you will do is load your material into the material editor and click on the little button next to the material thumbnail. This is the preview texture window, so change the Preview Texture Width and Height to 1024 and this should get rid of the blurriness. You can also automatically have all textures default to this by going to Preferences and changing Shader Texture Width and Height to 1024.
Hope this helps. If you have any other questions you can email us at support@zaxwerks.com
Sincerely,
Alex Dow
Tech Support