error in loading shared libraries

[ktb <xyf@inetnebr.com>]

I posted a little about this before but it seems I've screwed up some
libraries on my system.  I tried to upgrade my Slink to Potato 'libc6'
'ldso' 'xlib6' and xlib6g-dev' in order to install a program.  I
downgraded and things are mostly back to normal but I still see problems
hear and there.  Generally speaking can I address this problem as a
block or do I have to fix each problem as it comes along?  I don't know
much about libraries and I don't see much reading material on the
subject.  I do have a specific problem and maybe I can start there.  Jed
was installed on my system during installation.  When I try to run Jed I
get,
~$ jed
jed: error in loading shared libraries
/usr/lib/libgpm.so.1: undefined symbol: stdscr

How does one go about diagnosing and fixing library problems?
Thanks,
kent