Upgrading on Windows will cause the DBmarlin Tomcat Windows Service to run as Local System even if you had customised it to run as another user. You will need to change it again to run as another user.
If using Safari or Firefox you may see "Invalid Date" in the Changes tab or Change history screen for custom Events.
Hosts sensors should not consume DBmarlin licences. However, during the start-up of a host sensor, the free licence count is inadvertently checked. That means that if you have created and started the same number of instances as licences, you will not be able to start any hosts. The workaround is to stop a database instance sensor, then you will be able to start any host sensors. Once they are all running, then restart the one database instance agent that you closed. In that way all host and database sensors can be started. The regular checks to ensure that the licence counts are not exceeded to not have this error, so running host sensors will not then be shut down.