Classic / Basic UI doesn't load sitemap

I had OH2 running on build #84 but I was forced to wipe my setup and start from scratch. Now I use build #99 and my sitemap won’t load.
I get an error 500 that the sitemap does not exist. however it does. This is the same for the demo sitemap.
May this be a bug?

Don’t think so, on build #99 my sitemap is working fine.
I use http://<server_ip>:8080/
and http://<server_ip>:8080/classicui/app?sitemap=<sitemap_name>

Silly me… all it took was a reboot :\