From the Mythtv devs comes the following:-
"We are proud to announce MythTV 0.27.1.
0.27.1 is more than your traditional point release: 0.27.1 is our best release ever. While it doesn't have major new user features, it has received over 340 improvements. Lots have been rewritten under the hood to provide the best user experience ever. In particular, and to make the critics quiet, LiveTV has received an extreme levels of attention.
If you are still running an older version of MythTV, now is the time to upgrade."