CAPI/Cocoa default fonts now match the Apple Human Interface Guidelines (HIG). In LispWorks 5.1 and previous releases, the default fonts used by buttons and various text panes were slightly too small compared to what the Apple HIG specifies.
The font returned by a graphics ports Portable Font Description with
is now what Apple calls the "system" font. In LispWorks 5.1 and previous releases, it was the "User" font.