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Had the same problem for 10 days using latest master but with latest one that has revision updated to 1.3.0RC the plugin works again... Don't know why.
Loaded up today's release ( setup-mediaportal-git-1-2-200-11-customdatagrabber_and_serieslink-zip.121289 ) for MP 1.3 beta . Tvserver configuration utility is reporting that plugin sky-uk-channel-and-epg-grabberv1-2-0-35 is incompatible ? I just did a separate fresh install on a new partitoin following the step by step instructions.
Had the same problem for 10 days using latest master but with latest one that has revision updated to 1.3.0RC the plugin works again... Don't know why.