In the Source Linker, clicking on the profile ID for the currently attached person doesn't copy it
The universal behavior everywhere else on the site, including other people in the Source Linker, is to just copy the ID. For some reason, clicking the ID for the person the source is currently attached to — IF they're not the target person in the right column — doesn't copy the link, it just shows the person info on the right side of the page. It's probably easier to explain with a picture:
In the above situation, clicking on any ID in the right column will copy the ID, but clicking the ID for the linked person (GXS4-SR3) opens their info on the right — on the other three people, this happens when you click on their name. Whatever the UX reasoning was behind this, it's completely inconsistent and still trips me up every time, especially since it isn't clear what's happened until you actually try to use the profile ID.