--- a/Toolbox/Startup.py	Sat Feb 16 17:22:24 2019 +0100
+++ b/Toolbox/Startup.py	Sun Feb 17 12:57:26 2019 +0100
@@ -224,6 +224,9 @@
     """
     global application
     
+    if "__PYVENV_LAUNCHER__" in os.environ:
+        del os.environ["__PYVENV_LAUNCHER__"]
+    
     handleArgs(argv, appinfo)
     if app is None:
         # set the library paths for plugins