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Both WordPerfect and ZyXEL are aware of the problem.

Carl Oppedahl (oppedahl@panix.com) writes:
If WordPerfect customer support can be believed, there is a programming error 
in the ZyXEL firmware.

WP has supposedly been in communication with ZyXEL to urge them to make the 
modem recognize semicolons.

Brent Mosbrook (brentm@zyxel.com) [ZyXEL USA] acknowledged the bug and
"we are testing the fix right now, and will release it in approximately a 
week."

The problem has apparently been fixed in the v6.11 ROMs.  Problems were only
encountered in the high resolution modem, but not in the standard resolution
mode.