I have a colleague who has c1 1.3.6f installed on Winxp sp2, nw client 4.91 (sp is currently unknown).

Every time she adds or changes file system rights for a user, clicks apply/ok then goes back in they are gone.

I've got 2 machines here, both xp sp2, one with a flavor for 4.90 and one with 4.91 client and not having any problem.