Seg. fault in TPolyLine::DistanceToPrimative

Hi,

I recently updated to root 4.02.00. Since then an event display program which worked previously now crashes when I move the mouse over elements drawn on a 2D histogram. The gdb stack trace is appended. The last call is to TPolyLine::DistanceToPrimative. Has anyone else seen this? Any ideas why this may have once worked, but now does not?

Thanks,
Mark

0 0xb627cebf in TPolyLine::DistancetoPrimitive(int, int) ()

   from /usr/local/cern/root/4.02.00/lib/libGraf.so
#1 0xb60a963b in TPad::Pick(int, int, TObjLink*&) ()

   from /usr/local/cern/root/4.02.00/lib/libGpad.so
#2 0xb60a9603 in TPad::Pick(int, int, TObjLink*&) ()

   from /usr/local/cern/root/4.02.00/lib/libGpad.so
#3 0xb608223a in TCanvas::Pick(int, int, TObjLink*&) ()

   from /usr/local/cern/root/4.02.00/lib/libGpad.so
#4 0xb608aa57 in TCanvas::Pick(int, int, TObject*) ()

   from /usr/local/cern/root/4.02.00/lib/libGpad.so
#5 0xb608a27e in TCanvas::HandleInput(EEventType, int, int) ()

   from /usr/local/cern/root/4.02.00/lib/libGpad.so
#6 0xb57f3629 in TRootEmbeddedCanvas::HandleContainerMotion(Event_t*)
()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#7 0xb57f3d34 in TRootEmbeddedContainer::HandleMotion(Event_t*) ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#8 0xb5769f89 in TGFrame::HandleEvent(Event_t*) ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#9 0xb57490ff in TGClient::HandleEvent(Event_t*) ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#10 0xb5748d7d in TGClient::ProcessOneEvent() ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#11 0xb5748e85 in TGClient::HandleInput() ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#12 0xb574758a in TGInputHandler::Notify() ()

   from /usr/local/cern/root/4.02.00/lib/libGui.so
#13 0xb69b053c in TUnixSystem::DispatchOneEvent(bool) ()

   from /usr/local/cern/root/4.02.00/lib/libCore.so
#14 0xb68ec044 in TSystem::InnerLoop() ()

   from /usr/local/cern/root/4.02.00/lib/libCore.so
#15 0xb68ebfe9 in TSystem::Run() ()

   from /usr/local/cern/root/4.02.00/lib/libCore.so
#16 0xb688951e in TApplication::Run(bool) ()

   from /usr/local/cern/root/4.02.00/lib/libCore.so
#17 0xb5f2aacd in TRint::Run(bool) ()

   from /usr/local/cern/root/4.02.00/lib/libRint.so
#18 0xb72715e5 in EVDRootEnv::Run() (this=0x8e52060)

    at
/data/en/2b/users/messier/mippsoft/work/EventDisplay/EVDRootEnv.cxx:73
#19 0x08058e8b in main (argc=2, argv=0xbfffbc34)

    at
/data/en/2b/users/messier/mippsoft/work/EventDisplay/EVDMain.cc:75

-- 
Mark Messier                                 e-mail: messier_at_indiana.edu
Department of Physics            http://www.physics.indiana.edu/~messier
Indiana University                                 Phone: (812) 855-0236
Bloomington, IN 47405                                Fax: (812) 855-0440