I set up a digital miner on a world in the yogscast complete pack. It initially worked, but then it stopped searching for ores. I was able to press the search button, and some ores would be found, but then it would return to the Not Ready state, and the number returned to 0. This link http://pastebin.com/Mk8Jxuk4 is to the specific parts of the server log file which show the error causing the failure.

This should be fixed in v8!