Domain mapping isn't working. Using theme Newspaper from tagdiv and cpanel on the webhotel.

Last year I downloaded the plugin Domain mapping and gave it a try on my webhotel together with wordpress multisite, and it was a success - and then I deleted the testing environment. Now it is time to setup the large multisite network of 300 domains, but I cannot even make the domain mapping work..... :disappointed: The difference between last year and now is that all domains now are on the same webhotel as addondomains (cpanel). Last year the testing domains was split up on two webhotels. I have bought a dedicated IP for the lead domain, installed wordpress, enabled multisite, followed your instructions for the domain mapping plugin........as good as I could........but without success. Can anyone of you help?