Selection and visibility issue. May cause crash on closing file?
See attached file. Instructions also in file.
Select the lone (system-spanning) tie. Use "select all similar elements" then press "V" to make invisible. All the ties disappear except the tie you clicked on!
Now undo invisibility and untick the "visible" option in the Inspector instead. This time ALL the ties become invisible!
When I tried to close the file after this operation the program crashed.