This report probably can be linked as duplicate to bug #1663697 (same symptom on Windows 10 with 64bit trunk builds for extensions which spawn inkscape with verbs as arguments via Popen(); one with an external extension, the other with a bundled one).
This report probably can be linked as duplicate to bug #1663697 (same symptom on Windows 10 with 64bit trunk builds for extensions which spawn inkscape with verbs as arguments via Popen(); one with an external extension, the other with a bundled one).