i am using Kubuntu 18.04-LTS, 64bit. Yesterday I integrated the repository "ppa:kubuntu-ppa/backports" for testing and installed the updates.
Then I noticed that the CQRLOG Telnet DXCluster does not react or freeze after a short time.
The effect remains if you remove the repository with "sudo ppa-purge ppa:kubuntu-ppa/backports".
After copying the backup image back, the Telnet DXCluster window works normally again.
I can't find out where the problem is. Maybe the hint helps in general.