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On a few separate occasions I have been unable to manually fire artillery I first encountered it when I tried to fire a grudge thrower after pressing the insert key and going into manual mode. No mater what I did it would not let me fire any of the artillery pieces in that team. During this issue the bar on the left which I assume is the reload bar got stuck at what ever stage the artillery piece was at at the time I took over it.
A few battles later I was able to manual fire how ever the same issue occurred for me when trying to control a doom diver. I have used a Doom Diver Manually before so I know it works but on this occasion it would not let me fire the doom diver and the reload bar seemed to have stopped working again. I have footage of this incident but nothing out of the ordinary seems to have happened to the artillery piece that might have jarred it etc.