Big issue fixed here:

NSS Issues fixed after the release of N65NSS4A.EXE:
1. Fixed an abend in NSS when doing a file salvage operation. This
happens on pools where quotas or user space restrictions are in force
and the file has either a data strema (typical for MAC files) or an EA
(extended attribute).

(There are other issues fixed since 4a as well, it's in the text file
inside the download)