All,
We have just published a first patch release with openHAB 4.2.1, which fixes some issues that you had reported with 4.2.0. As usual, you can find the detailed release notes on GitHub.
For all users that use the CometVisu add-on in openHAB: Please note that 4.2.1 fixes four security vulnerabilities in this add-on and it is highly recommended to upgrade to the this latest version. You can find the links to the advisories in the release notes as well.