Object Spy will not recognize popup window in Firefox 42.0

Hello all,

I wonder if anybody has problems with Object Spy recognition of popup windows in latest 11.20.1491.7 TC release?

There is a strange behavior where Object Spy will only recognize the objects in main browser window in Firefox:

This is not occurring in Internet Explorer.

When running the tests in Firefox however, previously mapped objects in the popup will still be available and operable during the tests, so it seems as if only Object Spy is affected.

Any thoughts?

Many thanks for any hints,

Marin