I tested it as soon as 10.4.3 came out and on my machine it seems to work fine. Apple did make some changes to some Applescript commands I use but they seem to be performance changes only so it shouldn't matter for the app itself.

I was told today it doesn't work in 10.2 Jaguar. I've never had complaints about that before so I guess most people dont't use jaguar anymore but I'll fix it anyway.