Index: trunk/src/org/openstreetmap/josm/tools/ImageProvider.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 4869)
+++ trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 4870)
@@ -775,4 +775,5 @@
         double radian = Math.toRadians(angle);
 
+        new ImageIcon(img); // load completely
         int iw = img.getWidth(null);
         int ih = img.getHeight(null);