with bootnet.img from 4/07/2000 and update-disk from 4/07/2000
(per Bug Fix Advisory ID RHBA-2000:010-01), I get the following
exception/traceback during a portion of a kickstart done as
'linux updates ks=floppy':

...
File "/usr/lib/anaconda/mouse.py", line 93, in __init__
    apply(self.set, mouseType)
File "/usr/lib/anaconda/mouse.py", line 139, in set
    (gpm, x11, dev, em) = self.mice[mouse]
KeyError: none

If I go into 'Debug' and 'print mouse' it returns 'none'
(not None).

Note that RH6.2 kickstarts prior to these updated disks (that is,
the images that came with RH62 on CD) did not throw this
exception.

For what it's worth, my kickstart directives related to X
and mice are:

# probe, find
mouse
# probe, find
xconfig --card --monitor --startxonboot