"Detailed description of the issue: The Get(PrivilegeSetName) function no longer works in scripts, field calculations or when used to restrict access in a Privilege Set. When used it always returns [Full Access]. When the file is opened in FMP 7 thru FMP 9, the function works as expected."
I am not seeing this using FileMaker Pro Advanced 10.v1 on a Mac.
Perhaps the script is running with full access privileges?
Please see the following Knowledgebase article regarding Record Level Access Behavior in FileMaker Pro 10: