Serial can't find my devices

[Didier B]

open a terminal and type

openplotter-serial

copy here any error you get in the terminal

This summer I have noticed several issues linked to Serial (or signal K ?) :
(32 b version, Settings 2.9, Open CPN 5.6.2) : on starting  OpenCPN : No Fix, Checking Signal K : no green line for GPSD...
in Serial/ connections : the line for gnss is present. Select an delete, wait for 12 s, then re-select and Add to gpsd ...  Everything is working right ! (in Signal K green line is back !)
After stopping openplotter, on restart : No Fix ! ... Same treatment, cures again ...(repeatedly day after day ...)
Once, at startup : worked directly ! next startup : failed again .
Then Once, during navigation, the FIX disappeared ! Same process cured again (delete connection, recreate it)... (2 x12s seems veeeeeery long when heading towards a rocks field ...)

Lauching Serrial from terminal gives the following :
pi@openplotter:~ $ openplotter-serial
wrong external apps format: unexpected EOF while parsing (<string>, line 0)

(openplotter-serial:1348): Gtk-WARNING **: 14:50:01.815: for_size smaller than min-size (5 < 13) while measuring gadget (node radio, owner GtkRadioButton)

(openplotter-serial:1348): Gtk-WARNING **: 14:50:01.898: Negative content height -3 (allocation 1, extents 2x2) while allocating gadget (node radiobutton, owner GtkRadioButton)

(openplotter-serial:1348): Gtk-WARNING **: 14:50:01.899: for_size smaller than min-size (0 < 13) while measuring gadget (node radio, owner GtkRadioButton)

(openplotter-serial:1348): Gtk-WARNING **: 14:50:01.899: Negative content height -2 (allocation 0, extents 1x1) while allocating gadget (node radio, owner GtkRadioButton)