When a player logs out the multiblock structure for the Matter Overdrive fusion reactor becomes invalid. Before logging out: After logging back in: I checked to make sure that the whole structure is inside 1 chunk and it's within my claim: Additional Information: - Causing a block update on the multiblock structure (eg. putting a block on it) will reactivate it - Getting close to the lasers (Gravitational Stabilizers) will reactivate the laser but will not fix the multiblock. - Unloading the area (tp to spawn) and reloading the area causes the client to crash to desktop - Removing the bottom and top lasers does not change the behavior The structure is built correctly following this guide: