Cadabra was working normally but suddenly started to show some strange behaviors. For example, when I try to compile the file in the below link in the graphical interface, it crashes without any message and exits. Or if I add more commands to the file and save it, nothing happens! I mean if I close and open the file again, added lines don't exist!
I removed the installed folder of cadabra and re-installed it from GitHub but the problems persist.
I am using Cadabra on a fresh UBUNTU 16.04.3