The first rule of profiling is that by profiling you change the behaviour of a system. This can mean intermittent bugs, performance slowdowns, or general wierdness. Nothing earth shattering, but you just have to keep reminding yourself of it occasionally.
[Listening to: The Lion and the Cucumber (The Doctor and the Rockit Remix) – Dr Rockit – The Spirit of Vampyros Lesbos (5:48)]