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Hi Christopher- IDV 2.7u1 requires Java SE 6 (aka 1.6). You can download it at: http://support.apple.com/downloads/Java_for_Mac_OS_X_10_5_Update_4 Your system should support that version. Don Murray > I get the following fatal error on start up: > > java.lang.UnsupportedClassVersionError: Bad version number in .class file > at java.lang.ClassLoader.defineClass1(Native Method) > at java.lang.ClassLoader.defineClass(ClassLoader.java:675) > at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) > at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) > at java.net.URLClassLoader.access$100(URLClassLoader.java:56) > at java.net.URLClassLoader$1.run(URLClassLoader.java:195) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:316) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at java.lang.ClassLoader.loadClass(ClassLoader.java:251) > at com.exe4j.runtime.LauncherEngine.launch(Unknown Source) > at com.install4j.runtime.MacLauncher.main(Unknown Source) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:585) > at apple.launcher.LaunchRunner.run(LaunchRunner.java:115) > at apple.launcher.LaunchRunner.callMain(LaunchRunner.java:50) > at > apple.launcher.JavaApplicationLauncher.launch(JavaApplicationLauncher.java:52) > > More Info: > hw: MacBook Air > OS: Mac OS X 10.5.7 > java: Java(TM) 2 Runtime Environment, Standard Edition (build > 1.5.0_19-b02-304) > Java HotSpot(TM) Client VM (build 1.5.0_19-137, mixed mode, sharing) > IDV 2.6u2 still starts up successfully > > Ticket Details =================== Ticket ID: UGQ-180978 Department: Support IDV Priority: Normal Status: Open