In my experience with datalayer, you should be careful with devices, because they often either don’t work if the initial state was unloaded and some devices even prevent the unloading. (Therefore You can’t assign a datalayer directly to devices themselves anyway) - but in principle you can already use the datalayers for unloading (try without a pre-roll and directly only one frame for unloading - maybe this works better), but only if you don’t need them anymore in the further game (If you’re only interested in visibility, then separate devices of probs, or use an object manipulator)
ah okay, I thought you have the explosive device and prob mover also in the datalayer… but it`s important to know, that static meshes you reference with devices, e.g. the prob mover device, you should also take out from datalayer