I think we found a minor bug. When we try to join two spaces with a node and finesse throws an error saying Bug detected.

from pykat import finesse
from pykat.commands import * 
kat = finesse.kat()
kat.parse("""
l laser 1 0 n0
s s0 0.1 n0 n1_1
s s1 60 n1_1 n1
pd detect n1_1
noxaxis
""")

out = kat.run()

--------------------------------------------------------------
Error from Finesse (See 'pykat.lastErrorKat' for kat object):
  Bug detected! In function check_node_direction() of file
kat_matrix_ccs.c at line 3508. Error message: Node n1_1 is
connected to multiple components but does not have a direction
specified    Please report the version of Finesse you are
using and the input   file that caused the bug at
www.gwoptics.org/finesse/bug/. Thank you. 
--------------------------------------------------------------
An exception has occurred, use %tb to see the full traceback.

SystemExit: 1

This is probably due to the fact that the node has space on both sides and finesse cannot determine a direction for it. We encountered this while we were trying to get the beam parameters at a particular distance from a component.