I reported a single instance via "Report a Correction," but this is more systemic.
In text modules with a verse number of zero that contain notes (e.g., Psalm 5:0 in NET and NASB 1995), Instant Details does not work. Moving the cursor over the note symbol (or letter or number as the case may be) does not show Notes content from the corresponding Notes tool pertinent to the text. Moving the cursor over note markers in non-zero verses yields the expected behavior. Clicking the note symbol in the zero verse will open a tab in the Notes tool with the attendant note.
The same behavior occurs in Accordance for iOS. I discovered this anomaly while reading Psalms in the NET Bible as part of my morning reading using an iPad2. Click and hold does not bring up the Instant Details box. To read the note, one must open the relevant Notes tool in the split screen.
This is a minor annoyance, but clearly a bug.