[visionegg] I have a selective lesion in my mask2d computer circuit

We have installed visionegg on a MacBook (OSX 10.5.2) using Python 2.5 and the appropriate libraries for it. The visionegg demos all seem to work, including the alpha demos and the drum demo and other texture demos, but what does not work is those demos which use Mask2D. For instance, in the program at end of this message I have modified gabor.py by commenting out the circular mask. This makes the grating visible on our machine. However, if I uncomment out the mask, no stimulus is evident in the visionegg window!
Any ideas what could selectively affect Mask2D? We actually had everything working with an earlier install on this machine, using Python 2.4, but then we started getting bus errors with nearly every VisionEgg program we ran. We haven't managed to resurrect the original working Python 2.4 configuration, so we've moved on to Python 2.5. 

Below I'm pasting the latter part of the output of check-config.py :

SYNCLYNC_PRESENT = 0
VISIONEGG_ALWAYS_START_LOGGING = 0
VISIONEGG_CONFIG_FILE =
/Users/shihyulo/Desktop/visionegg-1.1.1/VisionEgg/VisionEgg.cfg
VISIONEGG_DARWIN_CONVENTIONAL_PRIORITY = -20
VISIONEGG_DARWIN_MAXPRIORITY_CONVENTIONAL_NOT_REALTIME = 1
VISIONEGG_DARWIN_PTHREAD_PRIORITY = max
VISIONEGG_DARWIN_REALTIME_COMPUTATION_DENOM = 2400
VISIONEGG_DARWIN_REALTIME_CONSTRAINT_DENOM = 1200
VISIONEGG_DARWIN_REALTIME_PERIOD_DENOM = 120
VISIONEGG_DARWIN_REALTIME_PREEMPTIBLE = 0
VISIONEGG_DOUBLE_BUFFER = 1
VISIONEGG_FRAMELESS_WINDOW = 0
VISIONEGG_FULLSCREEN = 0
VISIONEGG_GAMMA_FILE = custom.ve_gamma
VISIONEGG_GAMMA_INVERT_BLUE = 2.1
VISIONEGG_GAMMA_INVERT_GREEN = 2.1
VISIONEGG_GAMMA_INVERT_RED = 2.1
VISIONEGG_GAMMA_SOURCE = none
VISIONEGG_GUI_INIT = 1
VISIONEGG_GUI_ON_ERROR = 1
VISIONEGG_HIDE_MOUSE = 1
VISIONEGG_LOG_FILE = VisionEgg.log
VISIONEGG_LOG_TO_STDERR = 1
VISIONEGG_MAXPRIORITY = 0
VISIONEGG_MONITOR_REFRESH_HZ = 60.0
VISIONEGG_MULTISAMPLE_SAMPLES = 0
VISIONEGG_PREFERRED_BPP = 32
VISIONEGG_REQUEST_ALPHA_BITS = 0
VISIONEGG_REQUEST_BLUE_BITS = 8
VISIONEGG_REQUEST_GREEN_BITS = 8
VISIONEGG_REQUEST_RED_BITS = 8
VISIONEGG_REQUEST_STEREO = 0
VISIONEGG_SCREEN_H = 480
VISIONEGG_SCREEN_W = 640
VISIONEGG_SYNC_SWAP = 1
VISIONEGG_SYSTEM_DIR = /Users/shihyulo/Desktop/visionegg-1.1.1/VisionEgg
VISIONEGG_TKINTER_OK = 1
VISIONEGG_USER_DIR = /Users/shihyulo/VisionEgg

Version checklist:

Python version 2.5 (OK)
extra Python info: (r25:51918, Sep 19 2006, 08:49:13) [GCC 4.0.1 (Apple
Computer, Inc. build 5341)]
numpy version 1.0.4 (OK)
PyOpenGL (package "OpenGL") version 3.0.0b6 (OK)
pygame version 1.8.1release-svn1537 (OK)
Python Imaging Library (package "Image") version 1.1.6 (OK)

Optional module(s):

Pyro failed

-------------modified gabor.py below-----------------
############################
#  Import various modules  #
############################

import VisionEgg
VisionEgg.start_default_logging(); VisionEgg.watch_exceptions()

from VisionEgg.Core import *
from VisionEgg.FlowControl import Presentation
from VisionEgg.Gratings import SinGrating2D
from VisionEgg.Textures import Mask2D

#####################################
#  Initialize OpenGL window/screen  #
#####################################

screen = get_default_screen()

##########################################################
#  Create sinusoidal grating object and gaussian window  #
##########################################################

mask = Mask2D(function='gaussian',   # also supports 'circle'
radius_parameter=25, # sigma for gaussian, radius for circle (units: num_samples) num_samples=(256,256)) # this many texture elements in mask (covers whole size specified below) 

stimulus = SinGrating2D(#mask             = mask,
position = ( screen.size[0]/2.0, screen.size[1]/2.0 ), 
                        size             = ( 300.0 , 300.0 ),
spatial_freq = 10.0 / screen.size[0], # units of cycles/pixel 
                        temporal_freq_hz = 1.0,
                        orientation      = 45.0 )

###############################################################
#  Create viewport - intermediary between stimuli and screen  #
###############################################################

viewport = Viewport( screen=screen, stimuli=[stimulus] )

########################################
#  Create presentation object and go!  #
########################################

p = Presentation(go_duration=(5.0,'seconds'),viewports=[viewport])
p.go()



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