Recurring crashs due to the same error ("malloc, pointer being freed was not allocated") in various situations (7.0.13, Snow Leopard)

Hi everybody,
I just compiled IPE 7.0.13 on Mac OS X (10.6.5) using MacPorts for the
dependencies, the texlive2009 fontmap and by changing CONFIG += x86_64 to
x84 (it wouldnt compile as 64) in the config.mak. Everything seemed to work
well on a first peak, until I started doing some sketches.

Now and unfortunately very regulary Ipe crashes saying the following in the
terminal:
"ipe(15068,0x7fff70cd4ca0) malloc: *** error for object 0x1001add20: pointer
being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap"
The reproduction of this error is somewhat ambigous. Very often (but not
always) the crash occured when trying to move a vertex of a spline.
Furthermore Ipe also crashed like this when solely trying to draw a circle.

My config (as shown in the "about ipe" window) is as follows:
Lua 5.1.4
The font rendering library Freetype 2.4.4 / 2.4.4
The rendering library Cairo 1.10.0 / 1.10.0
The GUI toolkit Qt 4.7.1 / 4.7.1
The compression library zlib 1.2.5

Thank you for any help and for a great piece of software!

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