Reload of scene crash with multithreading or Geomagic

[epernod]

Not sure if both crashes are linked.
For sure using Geomagic, even when stoping simulation before reloading scene, it crashes.
Need to investigate more.

Dump (in release):

########## SIG 11 - SIGSEGV: segfault ##########
sofa::helper::BackTrace::dump
sofa::helper::BackTrace::sig
seh_filter_exe
seh_filter_exe
_C_specific_handler
_chkstk
RtlRaiseException
KiUserExceptionDispatcher
sofa::core::objectmodel::DDGNode::updateIfDirty