If no system actions were configured during rendering of the page, no system menu was added to the template.

hat caused system actions added during runtime (e.g. by API) to not show up until a re-rendering of the page.

src/octoprint/server/views.py

@@ -43,7 +43,7 @@ def index():
 
 	enable_gcodeviewer = settings().getBoolean(["gcodeViewer", "enabled"])
 	enable_timelapse = (settings().get(["webcam", "snapshot"]) and settings().get(["webcam", "ffmpeg"]))
-	enable_systemmenu = settings().get(["system"]) is not None and settings().get(["system", "actions"]) is not None and len(settings().get(["system", "actions"])) > 0
+	enable_systemmenu = settings().get(["system"]) is not None and settings().get(["system", "actions"]) is not None
 	enable_accesscontrol = userManager is not None
 	preferred_stylesheet = settings().get(["devel", "stylesheet"])
 	locales = dict((l.language, dict(language=l.language, display=l.display_name, english=l.english_name)) for l in LOCALES)

src/octoprint/templates/navbar/systemmenu.jinja2

@@ -1,4 +1,4 @@
-<a href="#" class="dropdown-toggle" data-toggle="dropdown">
+<a href="#" class="dropdown-toggle" data-toggle="dropdown" data-bind="visible: systemActions().length > 0">
     <i class="icon-off"></i> {{ _('System') }}
     <b class="caret"></b>
 </a>