Index: trunk/quest-plugin-core/src/main/java/de/ugoe/cs/quest/plugin/PluginLoader.java
===================================================================
--- trunk/quest-plugin-core/src/main/java/de/ugoe/cs/quest/plugin/PluginLoader.java	(revision 537)
+++ trunk/quest-plugin-core/src/main/java/de/ugoe/cs/quest/plugin/PluginLoader.java	(revision 582)
@@ -229,6 +229,8 @@
 			return false;
 		}
-		return filename.startsWith("quest-plugin-")
-				&& filename.endsWith(".jar") && filename.split("-").length == 4;
+		return filename.startsWith("quest-plugin-") && !filename.startsWith("quest-plugin-core")
+				&&
+				((filename.split("-").length == 4 && filename.endsWith(".jar")) ||
+				  filename.split("-").length == 5 && filename.endsWith("SNAPSHOT.jar"));
 	}