diff --git a/source/carla_host.py b/source/carla_host.py
index 4f7ae04cb..552dccd95 100644
--- a/source/carla_host.py
+++ b/source/carla_host.py
@@ -68,7 +68,7 @@ NSM_URL         = os.getenv("NSM_URL")
 # ------------------------------------------------------------------------------------------------------------
 # Host Window
 
-class HostWindow(QMainWindow, PluginEditParentMeta):
+class HostWindow(QMainWindow):
 #class HostWindow(QMainWindow, PluginEditParentMeta, metaclass=PyQtMetaClass):
     # signals
     SIGTERM = pyqtSignal()
@@ -1578,7 +1578,7 @@ class HostWindow(QMainWindow, PluginEditParentMeta):
         if pitem is None:
             return None
         #if False:
-            #pitem = CarlaRackItem(self, 0, False)
+            #return CarlaRackItem(self, 0, False)
 
         return pitem
 
@@ -1589,8 +1589,8 @@ class HostWindow(QMainWindow, PluginEditParentMeta):
         pitem = self.fPluginList[pluginId]
         if pitem is None:
             return None
-        #if False:
-            #pitem = CarlaRackItem(self, 0, False)
+        if False:
+            return PluginEdit(self, self.host, 0)
 
         return pitem.getEditDialog()
 
@@ -1602,7 +1602,7 @@ class HostWindow(QMainWindow, PluginEditParentMeta):
         if pitem is None:
             return None
         #if False:
-            #pitem = CarlaRackItem(self, 0, False)
+            #return AbstractPluginSlot()
 
         return pitem.getWidget()
 
diff --git a/source/discovery/carla-discovery.cpp b/source/discovery/carla-discovery.cpp
index 8b9f1a843..2cc78cb02 100644
--- a/source/discovery/carla-discovery.cpp
+++ b/source/discovery/carla-discovery.cpp
@@ -1112,7 +1112,7 @@ static void do_lv2_check(const char* const bundle, const bool doInit)
             }
         }
 
-        if (LV2_IS_GENERATOR(rdfDescriptor->Type[0], rdfDescriptor->Type[1]))
+        if (LV2_IS_INSTRUMENT(rdfDescriptor->Type[0], rdfDescriptor->Type[1]))
             hints |= PLUGIN_IS_SYNTH;
 
         if (rdfDescriptor->UICount > 0)
diff --git a/source/modules/lv2_rdf.hpp b/source/modules/lv2_rdf.hpp
index 54e59e479..74c4e81d3 100644
--- a/source/modules/lv2_rdf.hpp
+++ b/source/modules/lv2_rdf.hpp
@@ -291,6 +291,7 @@ typedef uint32_t LV2_Property;
 #define LV2_IS_EQ(x, y)                  ((x) & LV2_GROUP_EQ)
 #define LV2_IS_FILTER(x, y)              ((x) & LV2_GROUP_FILTER)
 #define LV2_IS_GENERATOR(x, y)           ((y) & LV2_GROUP_GENERATOR)
+#define LV2_IS_INSTRUMENT(x, y)          ((y) & LV2_PLUGIN_INSTRUMENT)
 #define LV2_IS_MODULATOR(x, y)           ((y) & LV2_GROUP_MODULATOR)
 #define LV2_IS_REVERB(x, y)              ((x) & LV2_GROUP_REVERB)
 #define LV2_IS_SIMULATOR(x, y)           ((x) & LV2_GROUP_SIMULATOR)
diff --git a/source/widgets/racklistwidget.py b/source/widgets/racklistwidget.py
index 3e09bfd73..f381dc44a 100644
--- a/source/widgets/racklistwidget.py
+++ b/source/widgets/racklistwidget.py
@@ -49,10 +49,10 @@ class RackListItem(QListWidgetItem):
 
         if False:
             # kdevelop likes this :)
-            from carla_backend import CarlaHostMeta
             parent = RackListWidget()
             host = CarlaHostMeta()
             self.host = host
+            self.fWidget = AbstractPluginSlot()
 
         # ----------------------------------------------------------------------------------------------------
         # Internal stuff
@@ -103,7 +103,7 @@ class RackListItem(QListWidgetItem):
         self.fWidget = createPluginSlot(self.fParent, self.host, self.fPluginId, self.fUseSkins)
         self.fWidget.setFixedHeight(self.fWidget.getFixedHeight())
 
-        self.setSizeHint(QSize(640, self.fWidget.getFixedHeight()))
+        self.setSizeHint(QSize(700, self.fWidget.getFixedHeight()))
 
         self.fParent.setItemWidget(self, self.fWidget)