Considering how tapered pipe threads are near leak proof, and assuming that it is really leaking at that point, I'm wondering if it's possible that the tap was run too far into the block, therby creating a "not tight enough" condition between the block and fitting. If it's possible to run the fitting into the block all the way up to the hex, then this may be the problem. If you clean up the threads real good with some carb or brake cleaner, then use some thread locker, maybe that will be enough to make it stop.
As for pictures, you can just send them to my personal email, and I can post them...
