The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
If you have questions about third-party templates, please use the User-written Templates
category or contact the author directly. This category should only be used for questions about templates developed and supported by the Kunena project.
I'm so glad you are appreciative of the time and consideration I gave your problem. I'm sure your css problems (or whatever they were- you haven't shared your solution) are the least of your problems in terms of turning users away.
Support?! I should ask for my money back if I was you.
I also had this challenge and I finally resolved a way to fix it. And thought that I would post my solution in case anybody else comes across this issue. I'm running Joomla 1.5.22 and Kunena 1.6.5. And my form boxes, in particular the login input fields and the select form elements were showing up with a dark and unexpected background color.
And even with the Blend with Joomla Template option off (in Kunena's template manager:: Components >> Kunena >> Template Manager) I was still picking up a weird background color on my form elements in Kunena.
So - yes even with the Blend Joomla Template option OFF, I added the following code to my Joomla template's custom.css (templates/your_joomla_template/css/custom.css) and that seemed to fix the trouble across browsers) and forced the background of my Kunena's form fields to white.
/* Kunena Form Field Fix */
#Kunena .inputbox {
background-color: #FFFFFF;
}