The Brackets "()" shows as "HL" in Mathematica 3.0, How to fix it?

[timxu9329 (Ting Xu)]

As you can see in the pic. All kinds of brackets show as H,L,@ and D, which should be (,),[,].

The program works fine, but this kind of display really is causing trouble reading and typing the code…

Anyone knows how to fix it?

Thanks a lot…