diff --git a/ChangeLog b/ChangeLog
index 8f595ff..1158376 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2581,3 +2581,9 @@ Mon Oct 11 22:24:12 PDT 1999	Michael Jennings <mej@eterm.org>
 	Sync after resize in auto mode.
 	
 -------------------------------------------------------------------------------
+Tue Oct 12 16:24:20 PDT 1999	Michael Jennings <mej@eterm.org>
+
+	Fixed a scrollbar refresh bug pointed out by Sung-Hyun Nam
+	<namsh@lgic.co.kr>.
+	
+-------------------------------------------------------------------------------
diff --git a/configure.in b/configure.in
index b35c72b..ff303ac 100644
--- a/configure.in
+++ b/configure.in
@@ -175,6 +175,15 @@ AC_ARG_WITH(debugging, [  --with-debugging[=num]  enable debugging output, num i
                   AC_DEFINE_UNQUOTED(DEBUG, 4)
 )
 
+AC_CHECK_FUNC(ptsname,
+              HAVE_PTSNAME=yes
+             )
+AC_CHECK_FUNC(grantpt,
+              HAVE_GRANTPT=yes
+             )
+AC_CHECK_FUNC(unlockpt,
+              HAVE_UNLOCKPT=yes
+             )
 dnl# Check for the appropriate pty mechanism
 AC_MSG_CHECKING(for pty mechanism)
 PTY_MECH=""
@@ -182,11 +191,11 @@ if test -e /dev/ptc ; then
   AC_DEFINE(HAVE_DEV_PTC)
   PTY_MECH="AIX $PTY_MECH"
 fi
-if test -e /dev/ptmx ; then
+if test -r /dev/ptmx -a ! -z "$HAVE_PTSNAME" -a ! -z "$HAVE_GRANTPT" -a ! -z "$HAVE_UNLOCKPT"; then
   AC_DEFINE(HAVE_DEV_PTMX)
   PTY_MECH="SVR4 $PTY_MECH"
 fi
-if test -e /dev/ptyp128 ; then
+if test -c /dev/ptyp128 ; then
   AC_DEFINE(HAVE_SCO_PTYS)
   PTY_MECH="SCO $PTY_MECH"
 fi
diff --git a/src/scrollbar.c b/src/scrollbar.c
index dbab783..dbb45b8 100644
--- a/src/scrollbar.c
+++ b/src/scrollbar.c
@@ -758,6 +758,9 @@ scrollbar_show(short mouseoffset)
 #endif /* MOTIF_SCROLLBAR || NEXT_SCROLLBAR */
   }
 #if defined(MOTIF_SCROLLBAR) || defined(NEXT_SCROLLBAR)
+  else if (image_mode_is(image_sb, (MODE_TRANS | MODE_VIEWPORT))) {
+    render_simage(images[image_sb].current, scrollBar.win, scrollbar_trough_width(), scrollbar_trough_height(), image_sb, 0);
+  }
   if (scrollBar.type == SCROLLBAR_MOTIF || scrollBar.type == SCROLLBAR_NEXT) {
     if (focus != TermWin.focus) {
       XGCValues gcvalue;