P: Enable/Disable Library Filters not working properly

I am running LR 3.4.1 on OS X 10.6.8. The Library>Enable Filters command does not work properly when I have a Library Filter set up to filter on more than on criterion.

For example, I have a Library Filter preset called "Needs Location Keywords" that selects all images for which don't have "Location" as one of their keywords and which are not flagged as Rejected. In other words, there are two filter criteria applied:

1) TEXT: Keywords "Don't Contain" "Location"
2) ATTRIBUTE: Flag = Flagged OR Flag = Unflagged

Toggling the Filter State by choosing Library>Enable Filters works as desired when the Filter State is changed to OFF; all images in the selected folder are displayed. However, when Library>Enable Filters is selected a second time, changing the Filter State back to ON, only one of the original filter criteria is applied, namely:

1) TEXT: Keywords "Don't Contain" "Location"

However, ATTRIBUTE Filtering is NOT re-enabled as one would expect.

This is repeatable with different filter settings and different folders.