Glass in maya has black sides and edges !

One of the issues Ive come across is the glass I was using was a mia material preset and I was rendering it and it came up completely black, i messed with the settings and got it to look partly transparent but the edges were black still! Getting very frustrated about it my good friend James http://shortshorts-skyarts.blogspot.com sorted me out with his glass shader. It worked first time without any issues. Check out his musical themed entry in the link above.