Excellent. No problem. Glad it's working.

FYI, it took about 2-3 days before I saw any payments. Now it is steady each day.
I think, for the record, if you need to use your IPv6 address then it will need to be wrapped in square brackets because the port designation uses the colon as well as the IPv6 address.
Eg.
masternodeaddr=[1fff:0:a88:85a3::ac1f]:51472