Hi Marcus,
I had the same problem. What worked for me was I un-installed HLM and then re-installed HLM from the installation DVD.
- Stop HLM by running /usr/sap/hlm_bootstraps/<SID>/HLM/stop-hlm.sh
- Check that all HLM processes are stopped: ps -ef | grep java
- rename /usr/sap/hlm_bootstraps/<SID> to /usr/sap/hlm_bootstraps/<SID>.old
- rename /hana/shared/<SID>/HLM to /hana/shared/<SID>/HLM.old
- Download HLM SPS7 patch 0 from the service.sap.com. Unpack it in a temp. subdirectory.
- As root user run ./hdbinst to install HLM again.
Now HLM should work again. Test it with a HTML5 compatible browser via the url: https://<FQDN>:1129/lsml/HLM/<SID>/ui/?sid=<SID>