Windows 7 shows strange samba behaviour with MBWE Blue rings

I have a 1TB WBWEII Blue Ring (fw 02.00.19), and since I upgraded to Windows 7, I’ve noticed some strange behaviour.

When I try to delete a non-empty directory, the directory disappears, but them appears again a few seconds later (or immediately with a refresh).

various samba bug trackers have described this as a known (and fixed) bug.

Is it possible to have a firmware upgrade that addresses this issue?