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To select all of one type of object, you can double click it.

Up to 80 objects. My larger bases have numbered much over 80 lights. At which point after you get the 80 out of the way you have to hunt and peck to find the last few remaining lights because the game tends to re-select the previous 80 you just turned off.

Edit: Also I tend to turn off all the doors during an eclipse, but there are doors that i like to have turned off all the time. So the group turning off and on for doors is tedious as i have to: group turn them off, group turn them on, then manually turn off the doors i dont want on.

Perhaps a UI grouping system? Wherein you can save certain sets of toggle-able objects to all be selected at once?

Yes, please. Maybe something as simple as another button that tells the light (and doors!) to turn off during an eclipse. Managing power when bases start to get a bit bigger during an eclipse is just down right annoying. However, a menu that gives you the ability to group and toggle multiple stacks of objects, the same or different, would be best.

I also ran into this bug following the same steps as Xanting: having the weapon in a rack, selling it, then buying it back. My colonists did pick up the weapon after I loaded an autosave though.

I think there is something else going on other than just no messages about traders. In my cassandra classic play through after I acquired 10 colonists almost all random events stopped. All i would get is raiders with the very inconsistent local squirrel going insane. This went on from about cycle 8 to cycle 14. During that time i tried checking the coms every day but every time there was no one available. Then one of my colonist dies, which brings me to 9 colonists, and right as her head hits the dirt I get a solar flare and shortly after a trade ship shows up.