It seems that it have a problem with OpenWRT revision 16568
Which version that you use to compile your firmware beta4 ?
In 0.6beta4 we used OpenWrt r15744
http://trac2.assembla.com/nightwing/browser/trunk/openwrt/trunk/.configGet used to have headaches while using latests OpenWrt
It's better to stay in a particular revision that works, and after you finish your work try a newer one. A to often 'svn up' will make you go crazy
Helene Gauthier
Saludos, Julio