g_timeout_add events stop when calling draw_brush()

[Douglas Phillipson <dougp intermind net>]

I'm using  g_timeout_add (500, grab_data, NULL) to aquire data from a 
file and shift it through an array with some procesing on it.  This all 
works fine.  At the end of the routine I call draw_brush to paint the 
data to the screen but the "timeout" event stops after the first call to 
draw_brush.  I can comment out the draw_brush() call and events happen 
as they should.  What might be causing this?

DSP