bug in close()?

[Ben Abbott]

	close(gcf)
	error: base_graphics_object::mark_modified: invalid graphics object
	error: invalid graphics handle
	error: evaluating if command near line 32, column 5
	error: evaluating if command near line 31, column 3
	error: called from `delete' in file `/sw/share/octave/3.0.0+/m/ 
miscellaneous/delete.m'
	error: evaluating if command near line 32, column 5
	error: evaluating if command near line 30, column 3
	error: called from `closereq' in file `/sw/share/octave/3.0.0+/m/plot/ 
closereq.m'
	error: evaluating for command near line 61, column 3
	error: called from `close' in file `/sw/share/octave/3.0.0+/m/plot/ 
close.m'

Can someone confirm this behavior?

I'm running a bleeding-edge version with some mods of my own. I'm  
running Octave on Mac OSX 10.5.1 with gnuplot-aqua.

Ben