Since I'm not a patch master, here's a verbal notice: hb-view.c line 233 is currently: #define ISALPHA(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z')) and should be: #define ISALPHA(c) (('a' <= (c) && (c) <= 'z') || ('A' <= (c) && (c) <= 'Z') || ('0' <= (c) && (c) <= '9')) Otherwise, the feature tags such as "ss01" are not recognized. A.