Nevermind my problem - there were a few mob spawners in the way of my Quarry and a diamond-level pickaxe (which is what I think the BC Quarry uses) isn't able to break them in the GregTech modpack I'm playing. Until I can find a way to remove them, the Quarry won't work at that location (they're up in the "frame" area of the quarry so I can just relocate the Quarry two blocks in the Y-direction and then it should run (I hope!).
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