[nirwana]

U need to fill bow and stern torpedo compartments with crewmembers to load stern externals. If a loading from external is in progress the eal is greyed out and u can see the status by hovering with the mousepointer over it. If its not greyed out its a rare bug which wil be usually fixed by submerging and surfacing again or a restart. Autoreload doesnt activate loading of externals. The grey or white buttons indicates that no reloading of this tube is in progress. If auto is on it means there are none in the internal reserve slots.

Occasionally in a storm the boat will be pushed back below surface for a few seconds and deactivates the external loading. U can monitoring it by going into crew management screen where the engine crew jumps forth and back between electric and diesel compartments. A resuming of the loading procedure by the game will not happen and the timer for moving them resets.