I have experienced similar symptoms on SAMBA drives. Try comparing the output of "id" with the numbers in the "ls -ln" output. I have a feeling either your /etc/passwd is not up to date on your work machine (i.e., you forgot to do "mkpasswd -d -u adefaria >> /etc/passwd"), or you log in as a different user than the one that owns the file (e.g., you log in as a local user, and the file is owned by the domain user [possibly with the same name]).
My uid is correct:
adefaria:ls -ln file
-rw-r--r-- 1 1370 513 0 Feb 27 19:01 file
adefaria:id
uid=1370(adefaria) gid=513(Domain Users) groups=1834(clearcase),512(Domain Admins),513(Domain Users),1170(Everybody),1354(Operations),1331(Software),1866(Software-US-Security)
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