I have an application called iFolder (www.ifolder.com), an open source project. I am running it from console. It's working fine in 10.4(Tiger) and 10.5(Leapord). But while running it in 10.5(Leapord), I am seeing the following message on console: *** -[NSConditionLock unlockWithCondition:]: lock (<NSConditionLock: 0x349220> '(null)' unlocked when not locked What's different in 10.5 Mac. Will I have to change my code such that it works on both 10.4 and 10.5 without any error? I want to know why it is not coming in 10.4 or why it is coming on 10.5?