[dizzyblonde]

I had a problem last year when the chain was over tightened which forced the sprocket seal out of placement, didn't drop oil in one dump, but was making it vanish quickly,and we couldn't figure out wher eit was coming from til I got home.
luckily I am clever and had some a litre of oil topping it up at various stops on the way home from Scotland.
We backed off chain, and the sprocket seal reseated itself.

NO, its not the same issue, I am just re-iterating YCs reply, the seal should be fine(fingers crossed) and tightening it back up again 'should' make the problem go away.
You should be able to tell if its done the job, as before you go out just get it up to temp, and see if it starts dripping, oil changes in viscosity when heated up and will find its way out if your seal is buggered

IIRC the seal is attached to a circular washer thing, I have a new one too, but never had to use it.