Platform: Mac OS, jEdit 4.5 Java 1.6.0_29
Courier New font text size 14 - doesn't show symbol [ ! ] and [ ' ]. In text size 16 symbol [ ! ] shows only as dot.
Anti Aliased smooth text set to [none].
This might be related to wrong chars in auxiliary fonts (Max Funk - #3474765, 3474534) which is in 5.0pre1 and will also be in the next 4.5.1 daily build.
Please try with the latest daily build of 5.0pre1 and see if you have this issue.
Tried with daily build of 5.0pre1 - works fine. Thanks!