Either the most recent patch or a GPU-driver-update fixed it

Hello Maxthall & dcx

Indeed we had a bug after yesterday's update, which led to some players experiencing endless loading screens. Please excuse any inconvenience and frustration this must have caused! In any case, we released a Hot Fix a few hours later removing this problem (and other smaller issues), since then we did not receive further reports. Please try again!

By the way, have you joined our Discord server yet? It is a great way to stay up to date with news, get in touch with the rest of the HMM Community as well as reaching us directly. Just visit the link below and become a part:

https://discordapp.com/invite/heavymetalmachines

Feel free to contact me if you have any further questions!
See you in the Arena!
Xanthos