editing files on Server 2008 messes up permissions

i've run problem that's bit baffling me.

we've got several macs in our office running 10.7.2. of these macs connect windows 2008 server on smb.

we're not having problems connecting shares , getting files, running problems when 1 of these macs saves changes file, file gets random account added it's acl isn't part of our active directory. it's showing "account unknown(s-1-5-88-3-448)" , gets added regardless of edits file or computer editing done on.

account set deny , has no privileges whatsoever on file , causing other users no longer able edit file.

if go in on windows machine , remove offending account acl on file, begins working again.

has started happening since upgraded 10.7.

have ideas?

 

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