confirmed on Windows 7, Inkscape 0.48.2. It appears to be some kind of numerical ill conditioning caused by a lot of nested transforms with large translations in them, very interesting.
@Alvin Penner (apenner)
and not from all the arrows.
The behavior started to occur when a particular arrow was pulled, namely the left one.
*****I like to add also, that the form was** GROUPED**, and it became **UNGROUPED** <- maybe you like to consider this as *****an additional/another bug.
*****You notice I had to go and **GROUP** The form in order to continue
o/s 7
Inkscape 0.48.2 r9819