After the last upgrade of DMSguestbook to 1.16.0 running WP 2.9.2 changed a few colors inside the CSS files. But still it's working very well. Further investigation is pending and I'll do it soon, perhaps.
But nevertheless it's far away from being critical and so important, but inside the text-box suddenly the color was too bright with a white background... :|
Thanks for the time and for the new version :)