BUG: Program/Source window "Mark In" switches window.
Using Premiere Pro 13.0.2 (Build 38)
If the Program and Source window are overlayed in the same panel using "Mark In" Command in the Source Window switches to the Program Window.
This makes it a bit cumbersome to use a layout where I want PGM and Source to be side-by-side so save space for other windows.
Tried with two different edit suites. Bug seems to be consistent from computer to computer.
EDIT: Found two computers where this doesn't happen. I was unable to reproduce the bug on these two machines with the same program version. Using Mac OSX Mojave