Hi,
I'm experiencing something in version 25.2.3 which I think is a bug.
Open a sequence in the source monitor and then click on the spanner and select open 'sequence in timeline'
If you then have another timeline open as well, scrubbing through that will switch back to the program monitor, but then returning to scrub through the source monitor timeline doesnt change the monitor back to source. On previous versions it did.
This makes 'pancake ediing a lot slower.