AMD-iMac 2009 HD4850 Submissions are not accepted.
I am using a iMac with Radeon HD 4850 using OpenCL 1.18:

I can see new jobs from pool.minexmr coming in 

But I am yet to see a single "Accepted" message in the log.

Whereas in the same host, with a CPU miner, I see a accepted once every 15 min.

Is there something wrong, if yes, how can I find that out ?