The disappearing and reappearing of the program that you just saw is normal.
It's so that the Crunchbox window isn't included in the screenshot.
/bin/sh: 1: scrot: not found
/bin/sh: 1: convert: not found
Traceback (most recent call last):
  File "/usr/share/crunchbox/crunchbox.py", line 129, in check_screenshot
    self.check_screenshot(cmd)
TypeError: check_screenshot() takes exactly 3 arguments (2 given)
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 66, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python2.7/dist-packages/apport/__init__.py", line 1, in <module>
    from apport.report import Report
  File "/usr/lib/python2.7/dist-packages/apport/report.py", line 18, in <module>
    import problem_report
  File "/usr/lib/python2.7/dist-packages/problem_report.py", line 14, in <module>
    import zlib, base64, time, sys, gzip, struct, os
  File "/usr/lib/python2.7/gzip.py", line 36, in <module>
    class GzipFile(io.BufferedIOBase):
AttributeError: 'module' object has no attribute 'BufferedIOBase'

Original exception was:
Traceback (most recent call last):
  File "/usr/share/crunchbox/crunchbox.py", line 129, in check_screenshot
    self.check_screenshot(cmd)
TypeError: check_screenshot() takes exactly 3 arguments (2 given)
^CTraceback (most recent call last):
  File "/usr/share/crunchbox/crunchbox.py", line 163, in <module>
    gtk.main()