Hi Andrew, I'm upgrading my code to work with 0.99, and I've played around with this error for a while now, and I'm stumped. I suspect I fell afoul of the new type check system, but you'll probably see immediately what needs to be changed to make this code 0.99 compliant: handle_evenhandle_event_callbacks = [(pygame.locals.QUIT, quit), (pygame.locals.MOUSEBUTTONDOWN, button_down.click), (pygame.locals.MOUSEBUTTONUP, mouse_button_up), (pygame.locals.KEYDOWN, keydown), (pygame.locals.KEYUP, keyup)] setup = Presentation(go_duration=('forever',), viewports=[viewportforsetup, left_mask, bracketviewport], handle_event_callbacks=handle_event_callbacks) The error message I get is as below: Traceback (most recent call last): File "controlprotocol9.py", line 494, in ? setup = Presentation(go_duration=('forever',), viewports=[viewportforsetup, left_mask, bracketviewport], handle_event_callbacks=handle_event_callbacks) File "/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packag es/VisionEgg/FlowControl.py", line 145, in __init__ VisionEgg.ClassWithParameters.__init__(self,**kw) File "/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packag es/VisionEgg/__init__.py", line 325, in __init__ raise TypeError("Parameter '%s' value %s is type %s (not type %s) in %s"%(parameter_name,value_str,type(value),tipe,self)) TypeError: Parameter 'handle_event_callbacks' value [(12, 'Use Ctrl-D (i.e. EOF) to exit.'), (5, <bound method ButtonDown.click of <__main__.ButtonDown instance at 0x27ae9e0>>), (6, <function mouse_button_up at 0x279c2b0>), (2, <function keydown at 0x279c2f0>), (3, <function keyup at 0x279c3b0>)] is type <type 'list'> (not type Sequence of Sequence2 of AnyOf(Integer or Callable)) in <VisionEgg.FlowControl.Presentation object at 0x27aea08> As always, thanks so much for your help! Mark ====================================== The Vision Egg mailing list Archives: //www.freelists.org/archives/visionegg Website: http://www.visionegg.org/mailinglist.html