Moving between files transfers selection range

Around the time I installed the latest update to Audition (currently running 13.0.13.46), it started a really bizarre behavior. Now every time I move between audio files, Audition transfers the selection (as shown in the Selection panel) from the file that was active, to the file I make active. It's most annoying, as it means that when I record a pickup on the "pickups" file, then go back to the main file, i.e., the one I am editing, I have to locate that section in that file all over again.

Is this some kind of Preference setting, or is it, as I suspect, a really annoying bug that was introduced in this update? It wastes a lot of my time; I have to remember to set a marker in the main file every time I want to record a pickup, or else go searching for where I was when I left that main file.

Help!!