samba - Oct 2002 - upgrade to 3.0alpha20: accented chars in filenames unreadable

Upon upgrading from 2.2.5 to 3.0alpha20 on Debian unstable, filenames
with accented characters (ie: ??? etc.) became unreadable. For example
in W2K a filename previously called "r?sum?.xls" became "r"
when looking at
the samba share; and the filename is impossible to modify from windows:
samba log says "file not found". From the shell the file looks like
"r?sum?.xls" but the "?" are actually 0x83.

Now, the file contents are intact and if modified from the unix command
line to non-accented they become accessible again from windows.

FWIW I used the following command to sanitize all filenames:

% rename -v 's/\x8c/i/g;s/[\x83\x8a\x82]/e/g' **/*

I know I'm using an "alpha" samba and "unstable" debian,
but still I'd
like to understand what happened, if possible.

Is this a known issue?