diff --git a/buildconfig/CMake/Packaging/launch_mantidplot.sh.in b/buildconfig/CMake/Packaging/launch_mantidplot.sh.in
index daae071f08fdd71b6fc44acf1905e0ead3506c0c..e1a6c9d5c14e01d36af2312c7a33a7e6b8da0525 100644
--- a/buildconfig/CMake/Packaging/launch_mantidplot.sh.in
+++ b/buildconfig/CMake/Packaging/launch_mantidplot.sh.in
@@ -13,9 +13,16 @@ INSTALLDIR=$(dirname $INSTALLDIR) # root install directory
 
 @VIRTUAL_GL_WRAPPER@
 
+# Define where python libraries are. ParaView paths are added by MantidPlot itself
+LOCAL_PYTHONPATH=@LOCAL_PYPATH@
+if [ -n "${PYTHONPATH}" ]; then
+    LOCAL_PYTHONPATH=${LOCAL_PYTHONPATH}:${PYTHONPATH}
+fi
+
 @GDB_DEFINITIONS@
 
 # Launch
 LD_PRELOAD=${LOCAL_PRELOAD} TCMALLOC_RELEASE_RATE=${TCM_RELEASE} \
     TCMALLOC_LARGE_ALLOC_REPORT_THRESHOLD=${TCM_REPORT} \
+    PYTHONPATH=${LOCAL_PYTHONPATH} \
     @WRAPPER_PREFIX@$VGLRUN $GDB $INSTALLDIR/bin/@MANTIDPLOT_EXEC@ "$@"@WRAPPER_POSTFIX@ || @PYTHON_EXECUTABLE@ @SCRIPTSDIR@/@ERROR_CMD@
diff --git a/scripts/ErrorReporter/error_dialog_app.py b/scripts/ErrorReporter/error_dialog_app.py
index df3da14ba2a208f5b4f52542f6396bfe93078973..d2ac6f5f0428750b800c9c3c18bfe8ce2edfd807 100644
--- a/scripts/ErrorReporter/error_dialog_app.py
+++ b/scripts/ErrorReporter/error_dialog_app.py
@@ -4,6 +4,8 @@
 #     NScD Oak Ridge National Laboratory, European Spallation Source
 #     & Institut Laue - Langevin
 # SPDX - License - Identifier: GPL - 3.0 +
+from __future__ import (absolute_import, print_function)
+
 import sys
 import argparse
 
diff --git a/scripts/ErrorReporter/error_report_presenter.py b/scripts/ErrorReporter/error_report_presenter.py
index bf7a7d6b6092029c62382a2890cfe067cc47920f..8902842fedef79f29a8c6efdb999ffa1fa378ff3 100644
--- a/scripts/ErrorReporter/error_report_presenter.py
+++ b/scripts/ErrorReporter/error_report_presenter.py
@@ -4,6 +4,8 @@
 #     NScD Oak Ridge National Laboratory, European Spallation Source
 #     & Institut Laue - Langevin
 # SPDX - License - Identifier: GPL - 3.0 +
+from __future__ import (absolute_import, print_function)
+
 import os
 
 from mantid.kernel import ErrorReporter, UsageService, ConfigService
diff --git a/scripts/ErrorReporter/errorreport.py b/scripts/ErrorReporter/errorreport.py
index 70cfe3243a160e7f972d8dc5dbf5e90c8b8b2ba0..039d87965538400653a21b6851a6f85bb4506f8b 100644
--- a/scripts/ErrorReporter/errorreport.py
+++ b/scripts/ErrorReporter/errorreport.py
@@ -4,12 +4,14 @@
 #     NScD Oak Ridge National Laboratory, European Spallation Source
 #     & Institut Laue - Langevin
 # SPDX - License - Identifier: GPL - 3.0 +
+from __future__ import (absolute_import, print_function)
+
 from qtpy import QtGui, QtCore, QtWidgets
 from qtpy.QtCore import Signal
 
 try:
     from ErrorReporter import resources_qt5 # noqa
-except ImportError:
+except (ImportError, RuntimeError):
     from ErrorReporter import resources_qt4 # noqa
 
 from mantidqt.utils.qt import load_ui