[Dcmlib] hangs on reading second dicom dataset

[Luca Picello]

hello everybody.
a quick question:
i have memory access violation (not very clear whitch line exactly but 
for sure in vtkGdmReader.cxx)
after the second load of a dicom dataset.
my pipeline is very easy (here simplified):

at the beginning : dicom_reader = vtkGdcmReader::New(); (one time only)

and the following at every directory change:
dicom_reader->RemoveAllFileName();
dicom_reader->AddFileName(FileDcm);
dicom_reader->Update();

at the second FileDcm load try it hangs. does anybody met same problem?
thanks

luca