R help - Sep 2003 - warning message from save.image()

Hi folks:

What does this warning message mean?
> save.image()
Warning messages:
1: namespaces may not be available when loading
2: names in persistent strings are currently ignored
> version
         _
platform alphapca56-unknown-linux-gnu
arch     alphapca56
os       linux-gnu
system   alphapca56, linux-gnu
status
major    1
minor    7.0
year     2003
month    04
day      16
language R

Thanks in advance.

Rajiv