Hi VYEO, can you post the recipe and the method please.
From the picture (BTW the first link doesn't work, and I didn't think the second one did either, but I found the cake amongst the wedding pics!!! Nice album!!!) it looks to be a fat problem. If it is a creaming method, I think you might have gone too far, and the butter was too melted, and hasn't done it's thing with the flour properly.
Or if it's a melt and mix method, this happens sometimes, and it's just trial and error, you may have needed to increase the ratio of flour to fat.