Howdy, Im having a little difficulty with a 7507, when I do sh run
it just returns a newline and doesn't show me any the running-configuration.
My privelege level is 15, and this worked yesterday. I also did wr term,
same thing.. New line.. Nothing.. My start-config hasn't been modified, and
show start works great. Everything is working Ok in the router, however I am
concerned for obvious reasons. 
Thanks,
-Drew
Reload it, and when it asks if you want to save the changed config, say no
(unless you're a masochist.)
Andy
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Andy Dills 301-682-9972
Xecunet, LLC www.xecu.net
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Dialup * Webhosting * E-Commerce * High-Speed Access
I've seen that before.
It's usually okay to just leave it running unless you really have a need
to show the running-config at this hour.
If I were you, I would wait and reboot the whole thing at like 4 in the
morning when not many people are online.
-hc
Usually the result of low memory condition. Do a "sh mem free" and look
at the "Largest(b)" column in the "Processor" row.
Reboot box in the next possible maint window and watch memory usage
closely, perhaps you have a mem leak in the IOS you're running.
Regards,
Daniel
PS: and please follow someone else's advise to post such questions to
    cisco-nsp 
Ironically, this happened to a buddy of mine this weekend, and he was in a
situation where he couldn't reload for several hours and really needed to
change the running config...so, I did a couple of searches to see if I
could figure anything out for him, and I came across a post by Jared Mauch
on the cisco list (this question would have been better asked there in the
first place) that suggested doing a "clear ip route *". Sure enough, that
cleared up the memory logjam and access to the running-config was
restored.
Andy
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Andy Dills 301-682-9972
Xecunet, LLC www.xecu.net
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dialup * Webhosting * E-Commerce * High-Speed Access
I've seen this too and it is caused by not having enough free memory to produce
the running config.
Clearing routes usually works as it frees up a lot of memory.
In my experience the only time this occurred in production was because of a
memory leak in the IOS, check your sh proc mem,m find the issue and consider if
it is a bug and a change of ios req'd
Steve