Webページに変更点が出ていませんが、NEWSによると、
Noteworthy changes in version 1.4.2.2 (2006-03-08) --------------------------------------------------
- Files containing several signed messages are not allowed any longer as there is no clean way to report the status of such files back to the caller. To partly revert to the old behaviour the new option --allow-multisig-verification may be used.
だそうです。
追記(3/10):
アナウンスが出ました。