This is a pretty minor nitpick, but it's still annoying. I'm sure it won't be fixed in RM6 - maybe I could hope for RM7?
In Lists->Source, highlight a Master Source, click Edit, do whatever editing you wish to do, exit Edit, and the Master Source that was highlighted originally is still highlighted. This is correct behavior, and it's a very good thing.
In Lists->Source, highlight a Master Source, click Print, do whatever printing you wish to do, exit Print, and the the Master source that was highlighted originally is no longer highlighted. You are kind of flying blind as to where you are. For example, if you wanted to highlight the next Master Source in sequence and click Print again, it's very hard to figure out where you are.
A workaround when exiting Print leaves the active Master Source without highlighting is to click Edit and immediately exit from the Edit dialog. This process will restore the needed highlighting of the current Master Source.