Conor I can verify this bug in Bookpedia and DVDpedia 5.9.2 Beta 128.
View > View Details and
⌘I still work
Also when I updated to DVDpedia 5.92. Beta 128 just now the entire Details view area was blank
UNTIL I clicked on the "Toggle Details View" button, but then that no longer worked when the Details returned.
As well if you click on the "Toggle Details View" button to the 'Off' greyed out mode and then Quit DVDpedia and then reopen DVDpedia the entire Details view area is blank till you click on the "Toggle Details View" button again and it turns the 'On' blue colour, the Details then return.
I also lost all my Spacing Customisations of the Toolbar, with all the spacings, fixed & flexible, now between the Buttons and the Search bar, with the Buttons all stacked up on the left of the Toolbar with no spacings.
I wonder if this is linked into the Toolbar Button Focus bug I reported the other week.
Text on Toolbar Buttons loosing focus