I have found that when you place a nuclear reactor with 6 reactor chambers and then place another reactor with some chambers so both chambers touch, the 6 chambered reactor will have an interface error. The objects inside and your inventory will still show but you can't see the grids. Using IC2 V1.00 with no extra mods.
Bug: Missing Nuclear Reactor Interface
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Apparently the reactor manages to count the 7th chambers as "adjacent" causing it to create a 10by6 grid. And of course there's no GUI for that.
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Extending this bug in order to not cluster up the forum with basically an extension of the bug. Included a screenshot showing a reactor 'cube.'
R - Reactor
C - ChamberLayer 1
RC
CCLayer 2
CC
CRThis allows for both reactors to make 6 chamber reactors... even though really there are only 3 facially adjacent chambers. Guess chambers connected even by just a vertex are considered adjacent right now.
Edit: Was using the forum search to find this thread and didn't manage to realize this was under IC1's section. So uh... oops?