I’ve noticed that the spacfg.xml seems to be malformed and it’s causing my scripts to break :’(
It seems that Linksys have added
<2nd_preferred_codec_1_ group="Ext_1/Audio_Configuration">
which presumably due to the fact that it starts with the number 2 is breaking it 
I’ve posted over on the Linksys boards and hopefully someone will be able to shed some light on it.
I haven’t seen it break anything. To view the spacfg.xml in its entirety (ignoring the warning) just use the view source functionality of your browser.
What scripts are breaking?
I have custom scripts that parse the XML to tell me what firmware versions people are using etc… which tells me if a phone needs updating / reconfiguring. When I try parsing the XML, I get errors telling me that it’s invalid. I’ve overcome the problem by rolling back to the previous firmware though.