I haven't, Livo, but that was also my own suspicion, since every other ingredient features in most if not all of my curries and none have ever carried this strange taste before ... Ah well, I will just have to stir in a good measure of Camp coffee and consume it as coffee-flavoured yoghurt.
[Afterthought : stir in to the yoghurt, not the curry !]
[After-afterthought : or it might have been the ginger, which was quite elderly — I shall have to try eating a slice in its raw state].