AMD and SGMiner is a real pain, i have 3 AMD cards and they work fine for some algorithms but then alot of others never bloody work.
Claymore or other miners need to start writing miners for AMD cards because these SGMiner or NSGMiner or whatever it is that uses the same core, has a lot of issues
Sorry to bad name them, but its the reality i have faced for ages now.
You can try --verbose or -T --verbose on your command line.
Not that it will tell you anything,  apart from warnings, but i have never found the real issue or error as to why the minder launches for example, and then just returns to the prompt, its ridiculous.