I am experiencing an annoying problem with the classic callouts (those
avaailable in OOo1.1x). It seems that the position of the end of the arm is not
stored/loaded correctly. The end-point position changes every time the file is
saved and then opened again. 
I have included a demo. Both an OpenDoc odp file and a pdf print out that shows
 how the slide looks on screen before save/open cycle. If you edit any other
sahp and save again, in cycles, you will see that the arrowheads of the two
green callouts ("Anclaje a membrana" and "cascada MAPKs") will move to the right
in each save/load cycle. The shift is consitent and repetitive: always to the
right and always by the same distance for all callouts in a slide.
It seems that there is common calculation that is performed in a different way
in the storing and loading algorithms for those elements (perhaps using
diferents units, an unintended offset present in only one of the operations).

I am a university teacher. I have presentations with hundreds of slides, with
many of those callouts. Every time I open such a file I need to scan all slides
to correct for these movements. This is terribly annoying (and time consuming). 
Essetially it means that I need to do again a lot of work every time the file is
saved (so corrupting the "Save" concept).

The movement is observed saving either in odp or sxi formats. Saving as ppt
preserves position, but transforms callout into a shape, so it is not a good
solution.

This happens in OOo 2.0.x. Suffered on 2.0, 2.01 and 2.0.2, both on Linux
(Ubuntu breezy) and Windows (2000, XP)

Enrique