Follow-up Comment #1, bug #23187 (project relax):
I cannot reproduce the bug with the following steps:
1)  Start relax in GUI mode.
2)  Open the prompt window.
3)  Type:
pipe.create('test', 'mf')
residue.create(res_num=1)
residue.create(res_num=2)
residue.delete(':2')
4)  Close the prompt window.
5)  Open the spin viewer window.
This is on a 64-bit GNU/Linux system with wxPython 2.8.12.1 (gtk2-unicode). 
Maybe it is operating system dependent, wxPython version dependent, or there
is something strange with the data.  A system test which triggers the bug will
be able to isolate the issue.
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