If you can successfully start nickel without fmon, it is possible that - for whatever reason (last read document, (re)generating missing (defect) cover, ...) - one of the pngs in kbmenupngs (exit_nickel, toggle_nightmode, etc.) is processed whenever you start nickel. If fmon is running in the background it might trigger the corresponding action (such as close nickel and go back to KSM or invert the screen) whenever this processing takes place. However, since restart_nickel(?) is no longer included in KSM I've no idea which icon could trigger a loop like the one you describe.
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