Preview's Missing Password Required dialog ignores last character entered

When previewing tables' data, the Missing Password Required dialog ignores the last character entered. If your password is "1234", the password stored in the ds.xml file is "123". Oddly, the dialog's OK button is enabled when it first appears (should it be-what if there's no password?). Upon entering the first character, the button is disabled, then it re-enables when the second character is entered.