(I haven't seen this after searching/browsing)
I have a custom layout which shows Details, Children, Siblings, and Image.
First issue: On startup, the Details window does not show. The workaround is to switch to the Standard layout and then back to my custom layout - then the Details window appears.
Second issue: When I switch the view to a different individual, the Details window does not change to show the individual selected, though the other three open windows do change. The workaround is to click either the Family or Tree tab on the Details window, and then click back to Person.