reproduced with Inkscape 0.47 r22583 and 0.47+devel r9273 on OS X 10.5.8

The lines displaced on 'Ungroup' are unconnected connector lines
(inkscape:connector-type="polyline") that have transformations of nested
parent groups incorrectly applied (resizing the page adds a
transformation to all top layers).

possibly related reports:
Bug #479553 “Moving shape with connectors, connectors go wild”
Bug #479638 “file gets mangled due to Object->UnGroup”


Since this will have to be fixed in trunk, it is important to note that current 
revisions of Inkscape 0.47+devel expose a further regression:

SVG preview in the file chooser and initial display of the SVG file on-canvas 
renders the unconnected connector lines inside nested transformed groups 
incorrectly (without even ungrouping them):
- the unconnected connector lines are drawn as if they had not been transformed 
according to page resize
- closing the 'Export Bitmap…' dialog (after exporting the page content) 
changes the drawing: the unconnected connector lines move even further away 
from the page content
- 'undo' after a random edit restores the rendering as intended (i.e. the 
drawing looks the same as initially when opened in 0.47)

correct preview/initial view:
 0.47 r22583
 0.47+devel r8843
 0.47+devel r8853

incorrect preview/intial view:
 0.47+devel r8865
 0.47+devel r9273

i.e. some changes committed between r8853 and r8865 have introduced new
errors when calculating the location of connector lines inside nested
transformed groups.

** Changed in: inkscape
   Importance: Undecided => Medium

** Changed in: inkscape
       Status: New => Confirmed

** Tags added: connectors groups transformations

-- 
Ungrouping objects changes position of arrow lines
https://bugs.launchpad.net/bugs/552289
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