Hi, these seem to be isolated issues with your setup. I'm a little bit perplexed why you needed to edit the XML to change
www.yourdomain.com specifically. There should have been a setting for this in the AdminCP, as well as a setting for the path to Special:Search that you could have played with until it went to the correct page.
It may have something to do with using
/wiki/index.php/Special:Search instead of just
/wiki/Special:Search, in your particular setup. I have had no problems using
& instead of
? on such setups in the past.
???