diff --git a/mtor/gui.py b/mtor/gui.py
index c339530..e60e20a 100644
--- a/mtor/gui.py
+++ b/mtor/gui.py
@@ -1,22 +1,18 @@
+import sys
+import os
+
 from pathlib import Path
 from subprocess import Popen
-home = Path.home()
 
-
-import sys
-import os
 from PyQt5.QtWidgets import (
     QApplication,
-    QMainWindow,
-    QPushButton,
     QDesktopWidget,
-    QHBoxLayout,
-    QVBoxLayout,
-    QWidget,
+    QFileDialog,
+    QGridLayout,
     QLabel,
     QLineEdit,
-    QGridLayout,
-    QFileDialog,
+    QPushButton,
+    QWidget,
 )
 from PyQt5.QtGui import QIcon, QIntValidator
 
@@ -24,7 +20,6 @@ from .workflows import (
     prescan_workflow,
     image_workflow,
     data_workflow,
-    cached_data_workflow,
     postprocessing_workflow,
 )
 
@@ -103,18 +98,11 @@ class MtorImageAnalysis(QWidget):
         grid.addWidget(self.btn_run, 9, 1)
 
         self.setLayout(grid)
-        #self.resize(350, 300)
+        # self.resize(350, 300)
         self.center_window_on_desktop()
         self.setWindowTitle("mTor Image Analysis")
         self.setWindowIcon(QIcon("web.png"))
 
-        # helpers
-        self.dir_selected.setText("/Users/holgerfrey/Developer/mtor/mtor-bilder")
-        self.roi_top_input.setText("50")
-        self.roi_right_input.setText("875")
-        self.roi_bottom_input.setText("300")
-        self.roi_left_input.setText("725")
-
         self.show()
 
     def center_window_on_desktop(self):
@@ -124,7 +112,7 @@ class MtorImageAnalysis(QWidget):
         self.move(fg.topLeft())
 
     def get_tif_dir(self):
-        dlg = QFileDialog(directory=str(home))
+        dlg = QFileDialog(directory=str(Path.home()))
         dlg.setFileMode(QFileDialog.Directory)
 
         if dlg.exec_():
@@ -139,7 +127,6 @@ class MtorImageAnalysis(QWidget):
                 self.dir_selected.setText(filenames[0])
                 self.check_button_state()
 
-
     def check_button_state(self):
         values = self.get_values()
         self.btn_run.setEnabled(all(values))
@@ -178,19 +165,26 @@ def run_gui():
     app.exec_()
 
     if mia.analysis_parameters is not None:
-        analysis_parameters = tuple( (p for p in mia.analysis_parameters) )
+        analysis_parameters = tuple((p for p in mia.analysis_parameters))
         pw = prescan_workflow(*analysis_parameters)
         iw = image_workflow(pw.parameters)
         dw = data_workflow(iw.data, iw.parameters)
         fw = postprocessing_workflow(dw.data, dw.parameters)
-        pdf_path = dw.parameters.data_dir / "report.pdf"
+        pdf_path = fw.parameters.data_dir / "report.pdf"
         if sys.platform.startswith("win"):
             os.startfile(str(pdf_path))
         else:
             if sys.platform.startswith("darwin"):
-                cmd = ["open", path]
+                cmd = ["open", str(pdf_path)]
             else:
-                cmd = ["xdg-open", path]
-            Popen(cmd, shell=False, stding=None, stdout=None, stderr=None, close_fds=True)
-            
+                cmd = ["xdg-open", str(pdf_path)]
+            Popen(
+                cmd,
+                shell=False,
+                stding=None,
+                stdout=None,
+                stderr=None,
+                close_fds=True,
+            )
+
     sys.exit()
diff --git a/mtor/workflows.py b/mtor/workflows.py
index fedd86d..e600d20 100644
--- a/mtor/workflows.py
+++ b/mtor/workflows.py
@@ -85,6 +85,7 @@ def postprocessing_workflow(selected_files, parameters):
     remove_cuts_dir(parameters)
     print("5/5: Post processing, annotating color coded images")
     annotate_color_coded_images(file_stems, parameters)
+    return WorkflowResult(None, parameters)
 
 
 def cached_data_workflow(folder):