diff --git a/src/client.c b/src/client.c
index 2271f254..361566fa 100644
--- a/src/client.c
+++ b/src/client.c
@@ -245,6 +245,20 @@ void wClientConfigure(WWindow * wwin, XConfigureRequestEvent * xcre)
 			wwin->flags.maximized &= ~(MAX_VERTICAL | MAX_LEFTHALF | MAX_RIGHTHALF | MAX_MAXIMUS | MAX_CENTRAL);
 
 		wWindowConstrainSize(wwin, (unsigned int *)&nwidth, (unsigned int *)&nheight);
+
+		/* Ignore tiny position adjustments from client ConfigureRequests to prevent
+		 * window jitters (e.g., VirtualBox sending incremental 1-2px corrections). */
+		if (wwin->flags.mapped && !wwin->moveresize.active && (xcre->value_mask & (CWX | CWY))) {
+			int dx = abs(nx - wwin->frame_x);
+			int dy = abs(ny - wwin->frame_y);
+
+			if (dx < 3 && dy < 3) {
+				/* Keep current position */
+				nx = wwin->frame_x;
+				ny = wwin->frame_y;
+			}
+		}
+
 		wWindowConfigure(wwin, nx, ny, nwidth, nheight);
 		wwin->old_geometry.x = nx;
 		wwin->old_geometry.y = ny;
diff --git a/src/window.c b/src/window.c
index 25170951..8a14a034 100644
--- a/src/window.c
+++ b/src/window.c
@@ -681,6 +681,15 @@ WWindow *wManageWindow(WScreen *scr, Window window)
 		return NULL;
 	}
 
+	/* Some applications create placeholder windows with 1x1 size
+	 * (e.g. VirtualBox internal windows). Don't manage those initial
+	 * 1x1 windows — wait for a proper ConfigureNotify/MapRequest with
+	 * a real size. */
+	if (wattribs.width <= 1 && wattribs.height <= 1) {
+		XUngrabServer(dpy);
+		return NULL;
+	}
+
 	wm_state = PropGetWindowState(window);
 
 	/* if it's startup and the window is unmapped, don't manage it */