Apart from the two possibilities already mentioned, the only other things I can think of are:
1. If you are not underwater, are you trying to load an external torpedo directly to the torpedo tube? It has to be moved to an internal reload slot first.
2. On the "Weapons Management screen", did you accidentally click on the icon to change from "automatic reloads" to "manual reloads" (where you have to drag the torpedo icon from an internal reload slot to the torpedo tube yourself to get it to load)?
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