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Yes, I tried from the terminal,  same.... empty tab.    I posted the results in the terminal window in my previous post.  (errorfile.txt)

Also, I noticed in step 3 of the instructions aux_gladevcp is referenced but there is no such file  YET the verify instructions reference gladevcp  (no aux_)   aux_gladevcp is again referenced in step 9.

One other observation... step 3,  NativeCAM filder is copied into /gladevcp but later the ini file references the path as ncam,   there does not seem to be a ncam folder.     (my very old linuxcnc with nativecam has a ncam folder)

It seems to me you (bothf you) have a problem showing up the interface.
Have you tried to run NativeCAM from the terminal?