This is the next bugfix release in the 2.5-branch. After introducing of the feature to notify the users, that logged in for the last time more than 3 years ago, the project forum sent hundreds of e-mails what caused the project page to get blacklisted because of sending spam. Thatswhy we limited the code to send only five e-mails per daily actions/per day to prevent the blacklisting.
Beside of that the Github user prbt2016 found a bug, that occurs only when installing the forum on a server with MySQL in versions 5.5 and 5.6. We recommend to use a newer MySQL version (at least 5.7 or MariaDB) but in case of a configuration with an older version of MySQL we want to prevent you as forum operators from not being able to use the 2.5-branch.
Additionally I came across a bug I introduced with the change from XHTML 1.0 to HTML (5) and the corresponding changes in CSS. On narrow screens/viewports the user menu was inaccessible because it slipped below the bottom border of the header because of the headers fixed height.
The changes are noticed in the release message on Github where one also can download the package of the new release.
Trenne niemals Müll, denn er hat nur eine Silbe!