I too have not been able to get my mod working. I firstly put my mod files in CustomAssets and they worked a treat - but using the directory structure described in this thread doesn't work for me. I get the name of my mod in the top corner but my changes are not in effect. I have checked all over for a cache directory (I am looking for hidden folders!) but there is nothing. I'm going to try deleting the game and reinstalling - I'll post back if that works.