Initialize logging before plugin manager, otherwise the logging output of the latter will not be visible

src/octoprint/plugin/core.py

@@ -223,6 +223,9 @@ class PluginManager(object):
 				implementations = plugin.get_implementations(plugin_type)
 				self.plugin_implementations[plugin_type] += ( (name, implementation) for implementation in implementations )
 
+		self.log_registered_plugins()
+
+	def log_registered_plugins(self):
 		if len(self.plugins) <= 0:
 			self.logger.info("No plugins found")
 		else:

src/octoprint/server/__init__.py

@@ -217,14 +217,15 @@ class Server():
 
 		# first initialize the settings singleton and make sure it uses given configfile and basedir if available
 		self._initSettings(self._configfile, self._basedir)
-		pluginManager = octoprint.plugin.plugin_manager(init=True)
 
 		# then initialize logging
 		self._initLogging(self._debug, self._logConf)
 		logger = logging.getLogger(__name__)
-
 		logger.info("Starting OctoPrint %s" % DISPLAY_VERSION)
 
+		# then initialize the plugin manager
+		pluginManager = octoprint.plugin.plugin_manager(init=True)
+
 		eventManager = events.eventManager()
 		analysisQueue = octoprint.filemanager.analysis.AnalysisQueue()
 		slicingManager = octoprint.slicing.SlicingManager(settings().getBaseFolder("slicingProfiles"))