Unable to delete files from MBL

I just noticed a new problem with the current firmware – since the most recent  update, I am unable to delete files from my 1TB MBL.  I can still copy files too the drive. I am under Mac OS X Lion, if it is relevant.  When attempting to delete a file, I get an “errror code -50”.  I have double checked all permissions (both globally and with the specific file I am trying to delete) and everything is fine, and I am logged in as an administrator.  Anyone else having similar issues or have advice?

Are you able to erase the files when you try from another OS other than Lion?