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 22.214.171.124 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 126.96.36.199 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.