Please attach a full log Mario27 and I'll add it to the todo list. 
The arena logic hasn't been updated yet, so it's possible it's just a incompatibility with the new code and old. I'd like to get more of that stuff updated and smoothed out soon, but we're still trying to work out some longer term big picture fixes with the design.
janusznazir, all known crash issues have been fixed from the previous update. If you're having startup issues, please see this thread. If you're constantly crashing after a few minutes, the only thing I can suggest is to not use any 3rd party tools alongside Hearthbuddy, and make sure your key came from us. For any other help on the issue, please use the Support forum, as I'm unable to help you in this thread.
The arena logic hasn't been updated yet, so it's possible it's just a incompatibility with the new code and old. I'd like to get more of that stuff updated and smoothed out soon, but we're still trying to work out some longer term big picture fixes with the design.janusznazir, all known crash issues have been fixed from the previous update. If you're having startup issues, please see this thread. If you're constantly crashing after a few minutes, the only thing I can suggest is to not use any 3rd party tools alongside Hearthbuddy, and make sure your key came from us. For any other help on the issue, please use the Support forum, as I'm unable to help you in this thread.