Thanks for your feedback.
Yes, it is working again, thanks!
I open several sites by selecting a folder and press Login. In version 5.15.1 the "Site folder" was showing the name of the sites, but in 5.15.2 it will now instead show the host name. So if i name my site to "mycoolsite" with IP address 188.8.131.52 and i login to this site only it will show "mycoolsite" in the tab, but if i instead select the site folder and press Login to open several sites it will now show the host name 184.108.40.206 in the tab.
So why will it use site name when i login on a single site and the host name when i login from a site folder? It make no sense.