If you still have trouble with invisible backspace during the login:
prompt this should fix it. Works for me.

-Frac
txy3340@ultb.isc.rit.edu
FRiC@#linux.irc.nolife


diff --context --recursive getty_ps.old/funcs.c getty_ps/funcs.c
*** getty_ps.old/funcs.c	Sun Apr 18 03:28:04 1993
--- getty_ps/funcs.c	Thu Feb 10 01:37:01 1994
***************
*** 721,727 ****
  		if (ch == Erase) {
  			if (count) {
  				if (!(lflag & ECHOE)) {
! 					(void) fputs(" \b", stdout);
  					(void) fflush(stdout);
  				}
  				--p;
--- 721,727 ----
  		if (ch == Erase) {
  			if (count) {
  				if (!(lflag & ECHOE)) {
! 					(void) fputs("\b \b", stdout);
  					(void) fflush(stdout);
  				}
  				--p;