Filename capitalization on server

Hi all, hope someone can help. We have a Windows NT 4.0 server w/ shared network drive on which each user has his/her own directory. Users report that in the last week or so, they are unable to create folder names in “ALL_CAPS” on their network directory. I have verified this. It appears to be system-wide. This is kind of a strange thing for users to get upset about but given the nature of what we do, it *is* actually an issue. I’m trying to figure out what setting the sysadmin could havechanged to cause this behavior. Any thoughts?
TIA,
Liz