Index: win32ss/gdi/ntgdi/pen.c
===================================================================
--- win32ss/gdi/ntgdi/pen.c	(revision 70281)
+++ win32ss/gdi/ntgdi/pen.c	(working copy)
@@ -150,7 +150,8 @@
         break;
 
     case PS_ALTERNATE:
-        pbrushPen->flAttrs |= BR_IS_BITMAP;
+        pbrushPen->flAttrs |= BR_IS_SOLID; //See CORE-9984.
+        //pbrushPen->flAttrs |= BR_IS_BITMAP;
         pbrushPen->hbmPattern = GreCreateBitmap(24, 1, 1, 1, (LPBYTE)PatternAlternate);
         break;