I just installed cadabra2by compiling from source on a machine running Linux Mint 18. I tested the command line version of cadabra, and it seems to work well (albeit with simple addition/multiplication of numerical and algebraic expresions; not with tensor quantities). The GUI version fails. After firing the gui with cadabra2-gtk I do get the GUI but evaluating a cell always fails, no matter what expression is in the cell. The message "cadabra-client: connection failed" prints on the terminal from which I fired Cadabra. I traced it to a function/method in ComputeThread.cc under the client_server subdirectory in the source code.
Any suggestions to get around this problem? Any help will be appreciated.