Segmentation Fault when playing images sequence

[BastienLaby]

Select image sequence in the browser then press the play button.
Multiple differents errors when testing multiple times.

./run_buttleofx.sh : ligne 24 : 9161 Erreur de segmentation (core dumped) $PYTHONHOME/bin/python $BUTTLE_TOP_DIR/ButtleOFX/buttleApp.py

./run_buttleofx.sh : ligne 24 : 9177 Erreur du bus (core dumped) $PYTHONHOME/bin/python $BUTTLE_TOP_DIR/ButtleOFX/buttleApp.py