(that was 'test this' written in TexEdit on my iBook and then pasted into this comment form - Firefox 2.0.0.3 on Intel Mac Mini)
If I paste it into TextEdit and then cut and paste within the same machine, it works fine. I'm still using 3.7 though & I just live with this 'cos I don't want to lose the multiple screen functionality.
Interesting to see that my 'test' = 琀攀猀琀 as does euriwaru's 'test' so it's not a randomised garbage thing.