[ROOT] python ROOT access

Hi ROOTers,
could someone with pyROOT configured properly check the following in python:

(ROOT 5.19/01)

$ python
Python 2.5.2 (r252:60911, Feb 27 2008, 18:32:21)
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import ROOT
>>> combi  = ROOT.TGeoCombiTrans()
>>> matrix = combi.GetRotationMatrix()
>>> print matrix[0]
1.0
>>> matrix[0]=0.99

 *** Break *** segmentation violation
(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
Attaching to program: /proc/8053/exe, process 8053
[Thread debugging using libthread_db enabled]
[New Thread 0xb7d428c0 (LWP 8053)]
[New Thread 0xb521db90 (LWP 8069)]
(no debugging symbols found)...done.

0xb7eef410 in __kernel_vsyscall ()
error detected on stdin
The program is running.  Quit anyway (and detach it)? (y or n)
[answered Y; input not from terminal]
Detaching from program: /proc/8053/exe, process 8053

>>> combi = ROOT.TGeoRotation()
>>> matrix = combi.GetRotationMatrix()
>>> matrix[0]
1.0
>>> matrix[0]=0.99
>>> print matrix[0]
0.99

In the same time doing quite the same with TGeoRotation instead works OK.
What's my error then ? Or what's the proper way of feeding a TGeoCombiTrans
from python with [x,y,z] as translation and [1,0,0,0,1,0,0,0,1] as
rotation "matrix" ?

Regards
Michal