I have a starlight infuser. I know it's set up correctly as I've checked all the liquid starlight and used it before. But it just won't work anymore! Not at night, not by day, and I'm just infusing aquamarines, which worked before. I've tried breaking the multiblock, and replacing the infuser itself.

You're missing liquid starlight somewhere, or you weren't right clicking with the resonating wand.

Assuming you didn't rebuild the multiblock incorrectly, now.

I am having this issue aswell in the newest build. I have checked and rechecked the multiblock multiple times.

Version of mod, version of forge, full modlist involved in the MC instance.

I have so far been unable to replicate this behavior on my own, so I need more info for later on when I have time to dig through it more and try to get it to fail. Because employment and family takes time out of day, and HellFire's been working on code stuff.

Ancientcraft-1.4.zip
This is the mod profile exported from twitch launcher if you want to go that route.
Forge 14.23.0.2550 Astralsorcery-1.12.2-1.8.2 Quark is installed, but no quark marble is used. All blocks used in the multi block are Astral Sorcery.
CodeChicken Lib 1.8.+ (by covers1624)
Ancient Warfare 2 (by shadowmage45)
BiblioCraft (by JDSinclair)
The Twilight Forest (by Benimatic)
Astral Sorcery (by HellFirePvP)
Inventory Tweaks (by Kobata)
Just Enough Items (JEI) (by mezz)
Just Enough Resources (JER) (by Way2muchnoise)
AutoRegLib (by Vazkii)
Quark (by Vazkii)
The One Probe (by McJty)
Fast Leaf Decay (by Olafskii)
MalisisCore (by Ordinastie)
MalisisDoors (by Ordinastie)
Reliquary v1.3 (by P3pp3rF1y)
More Overlays (by feldim2425)
The Beneath (by Shinoow)
Chisels & Bits (by AlgorithmX2)
ConnectedTexturesMod (by tterrag1098)
Chisel (by tterrag1098)
Iron Chests (by progwml6)
Better Builder's Wands (by Portablejim)
JourneyMap (by techbrew)
Mantle (by mDiyo)
Tinkers Construct (by mDiyo)
ShetiPhianCore (by ShetiPhian)
MultiStorage (by ShetiPhian)
IvToolkit (by Ivorforce)
Recurrent Complex (by Ivorforce)
iChunUtil (by iChun)
Mob Dismemberment (by iChun)
Bloodmoon (by lumien231)
Dynamic Surroundings (by OreCruncher)
Diet Hoppers (by RWTema)
The Lost Cities (by McJty)
TheDragonLib (by sokratis12GR)
Shadowfacts' Forgelin (by shadowfactsmc)
ArmorPlus (by sokratis12GR)
AtomicStryker's Infernal Mobs (by AtomicStryker)
Block Drops (JEI Addon) (by MrRiegel)
AtomicStryker's Battle Towers (by AtomicStryker)
Hardcore Darkness (by lumien231)
AppleCore (by squeek502)
Hunger Overhaul (by progwml6)
ToroHealth Damage Indicators (by ToroCraft)
Lost Souls (by McJty)
MeeCreeps (by McJty)
ElecCore | Rendering Library (by Elec332)
Elemental Dimensions (by McJty)
Immersive Craft (by McJty)
Aqua Munda (by McJty)
FTBLib (by FTB)
FTB Utilities (by FTB)
FTB Guide Book (by EmoKiba)
Persistence (by ChesterChair)
Soul Shards: The Old Ways (by SgtPunishment)

What's the block under your infuser itself? The one surrounded by the 8 runed marble.

Also check the liquids around the infuser if it did consume any and you have to refill.

Hi, I'm having same problem for FTB Direwolf20 1.12.2 v1.30 and v1.40 mod pack. Also one question, we have 8 runed marbles surrounding the lapis block and also 4 runed marbles in the corners (diagonally) touching the inner 3x3)? If thats the case I have no other idea why it shouldn't work (short of a bug).

@forry This is better suited for the Discord channel, with screenshots.

9/10 times, you're missing one of the 12 starlight buckets

I seemingly had this problem.

What I did was that I first placed the starlight infuser, then built the surrounding multiblock. Apparently you have to place the starlight infuser last? Breaking and replacing the starlight infuser fixed it.