Sometimes the power shutoff gets stuck in the wrong state. This causes lots of problems in many places, but most often with battery switching designs. I captured the bug, right before it happened, in this save (hoping the exact moment at which the bug occurs can help you track it down).
Here are some pictures to go along with the bug.
Here we have two correctly working shutoffs. Notice that the "Enabled by.." or "Disabled by.." message appears FIRST in the tooltip list.
Here is an incorrectly working shutoff. Notice that the "Inactive" state appears above the "Enabled by..." message.
Whether this order difference is related or not to the cause of the bug, I did find the inconsistency odd (and hopefully helpful in tracking it down).
Here are a few others bug reports of this same issue. I'll link to them all here, and link back from each to this post, to help with cross referencing.
- This bug report is stuck in the "active" position (it's not in a battery switching station, but is close to a battery).
- Here another battery switching station got stuck in the "inactive" position.
- One more, with a save file attached, to illustrate the same problem .
In all of the pictures provided, the state appears above the "Enabled by..." or "Disabled by..." message, whereas working shutoffs always have the order of these messages reversed.
Open the save file. Notice that the shutoffs are currently correctly configured (though the game sets all signals to "inactive" at the start). Then watch as all shutoffs go into inactive state, despite two of them receiving an active signal.