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There was a change made a few patches ago that permitted knowledge hacking when outside supply. There's a Mantis report about the unclear interface at Mantis 012966.
Any chance this could make it into the next patch? Its a stupidly minor thing, but still kind of annoying. I was trying to figure out what was wrong with my flashing-red science lab for quite some time before I remembered this thread, and saw it was just a UI problem.
Fixed a bug where the MkI and MkII science labs still claimed to require supply, when in fact they (intentionally) function just fine without it.