Index: trunk/src/org/openstreetmap/josm/tools/ImageProvider.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 10409)
+++ trunk/src/org/openstreetmap/josm/tools/ImageProvider.java	(revision 10410)
@@ -843,5 +843,5 @@
                     case typeArchive:
                         if (archive != null) {
-                            cacheName = "zip:"+archive+":"+cacheName;
+                            cacheName = "zip:"+archive.hashCode()+":"+cacheName;
                             ImageResource ir = cache.get(cacheName);
                             if (ir != null) return ir;