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User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)

Description of problem:
With upgrade pack (7.1 to 7.2), booting from CD1 is OK. Been asked for 
language, keyboard, mouse and for partition migration to new filesystem. After 
a screen proposing the new GRUB multiboot system, it gives out a strange 
message:
An unhandled exception has occured. This is most likely a bug. Please copy the 
full text of this exception...and send a bug report against anaconda to 
bugzilla !!!
I tried many combinations, but all produced the SAME (bad) result!

Version-Release number of selected component (if applicable):


How reproducible:
Sometimes

Steps to Reproduce:
1.Boot from upgrade pack CD1
2.Setup language (any), keyboard (tried with US, SG and GE)
3.Let automatic package selection (same with manual selection)
4.Migration to new filesystem: irrelevant
5.GRUB/LILO/No boot setup will be irrelevant
6.After begining to copy files, unhandled exception occurs
	

Actual Results:  Error message box (to save to floppy). After click on OK, CD 
is ejected and system restored to reboot.
The error message begins like this (full text in attachement):
Traceback (innermost last):
  File "/usr/bin/anaconda", line 620, in ?
    intf.run(id, dispatch, configFileData)
  File "/usr/lib/anaconda/gui.py", line 350, in run
    self.icw.run (self.runres, configFileData)
  File "/usr/lib/anaconda/gui.py", line 778, in run
    mainloop ()
  File "/usr/lib/python1.5/site-packages/gtk.py", line 2608, in mainloop
    _gtk.gtk_main()


Expected Results:  Should upgrade correctly!

Additional info:

Tried on 2 different hard disks (MAXTOR 1.8GB and WESTERN 2.1GB) with minimal 
Linux RH 7.1 workstation (both bootable and OK).
Tried on 2 different HW, but both with AMD CPUs (250 and 450MHz).
Both machines have different CD-drive models.