Put two number boxes, # 1, # 2 and a multiplier
Connect # 1 to input 0 of the multiplier
Connect # 2 to input 1 of the multiplier.
Thereupon a third cord appears at the output of # 2, and cannot be removed. It follows the cursor everywhere, even in the menu bar.

It can only be removed by saving, closing and reopening the file.
I have reproduced this behaviour a number of times, always the same.
[Note also that Ctrl+W does not close the file, it asks whether to save changes, but then does not close the file. Ctrl+W has to be done a second time.]
I am running pd-l2ork version 20200802.
uname -a Linux velikiHP 5.6.0-0.bpo.2-amd64 #1 (closed) SMP Debian 5.6.14-2~bpo10+1 (2020-06-09) x86_64 GNU/Linux
KDE desktop
.................
Now updated to Pd-l2ork version 20200821. Rogue, aka zombie cord phenomenon seems to have been suppressed (out of interest, how and by whom?). For the record, in 20200802 I found that Alt+Shift killed the zombie.
No. retracting that, it still happens sometimes, the Alt+Shift trick works; rather baffling though.
Paul Pignon
Put two number boxes, # 1, # 2 and a multiplier

Connect # 1 to input 0 of the multiplier
Connect # 2 to input 1 of the multiplier.
Thereupon a third cord appears at the output of # 2, and cannot be removed. It follows the cursor everywhere, even in the menu bar.
It can only be removed by saving, closing and reopening the file.
I have reproduced this behaviour a number of times, always the same.
[Note also that Ctrl+W does not close the file, it asks whether to save changes, but then does not close the file. Ctrl+W has to be done a second time.]
I am running pd-l2ork version 20200802.
uname -a Linux velikiHP 5.6.0-0.bpo.2-amd64 #1 (closed) SMP Debian 5.6.14-2~bpo10+1 (2020-06-09) x86_64 GNU/Linux
KDE desktop
.................
Now updated to Pd-l2ork version 20200821. Rogue, aka zombie cord phenomenon seems to have been suppressed (out of interest, how and by whom?). For the record, in 20200802 I found that Alt+Shift killed the zombie.
No. retracting that, it still happens sometimes, the Alt+Shift trick works; rather baffling though.
Paul Pignon