My aunt has a problem with water leaking down the outsdie of her chimney into her house. They just had a new roof put on and was told that the boards around the chimney were ok. Is there a product out there that would seal around the chinmey to help keep the water out.
If a roofer did this, then call them to fix the problem. If you did this yourself, then of course you'll have to fix the problem. It is more than likely the flashing around your chimney, either it was not put on correctly or there is a gap that the tar did not fill. Retar all seams around the flashing and this should take care of the problem.