diff -up vnc-4_1_2-unixsrc/unix/tx/TXViewport.h.scrollbars vnc-4_1_2-unixsrc/unix/tx/TXViewport.h
--- vnc-4_1_2-unixsrc/unix/tx/TXViewport.h.scrollbars	2008-03-14 12:44:19.000000000 +0100
+++ vnc-4_1_2-unixsrc/unix/tx/TXViewport.h	2008-03-14 12:44:19.000000000 +0100
@@ -77,7 +77,8 @@ private:
   int xOff, yOff;
   rfb::Timer bumpScrollTimer;
   bool bumpScroll;
-  bool needScrollbars;
+  bool needXScrollbar;
+  bool needYScrollbar;
   int bumpScrollX, bumpScrollY;
 };
 #endif
diff -up vnc-4_1_2-unixsrc/unix/tx/TXViewport.cxx.scrollbars vnc-4_1_2-unixsrc/unix/tx/TXViewport.cxx
--- vnc-4_1_2-unixsrc/unix/tx/TXViewport.cxx.scrollbars	2008-03-14 12:44:19.000000000 +0100
+++ vnc-4_1_2-unixsrc/unix/tx/TXViewport.cxx	2008-03-14 13:08:30.000000000 +0100
@@ -25,7 +25,8 @@
 TXViewport::TXViewport(Display* dpy_, int w, int h, TXWindow* parent_)
   : TXWindow(dpy_, w, h, parent_), child(0), hScrollbar(0),
     vScrollbar(0), scrollbarSize(15), xOff(0), yOff(0), bumpScrollTimer(this),
-    bumpScroll(false), needScrollbars(false), bumpScrollX(0), bumpScrollY(0)
+    bumpScroll(false), needXScrollbar(false), needYScrollbar(false),
+    bumpScrollX(0), bumpScrollY(0)
 {
   clipper = new TXWindow(dpy, width()-scrollbarSize, height()-scrollbarSize,
                          this);
@@ -132,13 +133,23 @@ bool TXViewport::handleTimeout(rfb::Time
 
 void TXViewport::resizeNotify()
 {
-  needScrollbars = (!bumpScroll &&
-                    (width() < child->width() || height() < child->height()) &&
-                    (width() > scrollbarSize && height() > scrollbarSize));
-  if (needScrollbars) {
+  needXScrollbar = (!bumpScroll && width() < child->width() &&
+		    height() > scrollbarSize && width() > scrollbarSize);
+  needYScrollbar = (!bumpScroll && height() < child->height() &&
+		    height() > scrollbarSize && width() > scrollbarSize);
+
+  if (needXScrollbar && needYScrollbar) {
     clipper->resize(width()-scrollbarSize, height()-scrollbarSize);
     hScrollbar->map();
     vScrollbar->map();
+  } else if (needXScrollbar) {
+    clipper->resize(width(), height()-scrollbarSize);
+    hScrollbar->map();
+    vScrollbar->unmap();
+  } else if (needYScrollbar) {
+    clipper->resize(width()-scrollbarSize, height());
+    hScrollbar->unmap();
+    vScrollbar->map();
   } else {
     clipper->resize(width(), height());
     hScrollbar->unmap();
@@ -147,10 +158,13 @@ void TXViewport::resizeNotify()
 
   setOffset(xOff, yOff);
 
-  if (needScrollbars) {
+  if (needXScrollbar) {
     hScrollbar->move(0, height()-scrollbarSize);
     hScrollbar->resize(width()-scrollbarSize, scrollbarSize);
     hScrollbar->set(child->width(), -xOff, width()-scrollbarSize);
+  }
+
+  if (needYScrollbar) {
     vScrollbar->move(width()-scrollbarSize, 0);
     vScrollbar->resize(scrollbarSize, height()-scrollbarSize);
     vScrollbar->set(child->height(), -yOff, height()-scrollbarSize);