Fix

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -352,7 +352,8 @@ public class FragmentAccount extends FragmentEx {
                     colorPickerDialog.show(getFragmentManager(), "colorpicker");
                 } else {
                     FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
-                    fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
+                    fragmentTransaction.hide(FragmentAccount.this);
+                    fragmentTransaction.add(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
                     fragmentTransaction.commit();
                 }
             }