I'm sorry, but you're going to need to supply the "final USFM" (see view/edit tab) for the relevant verse/line before anyone can help, also some that *do* work, and probably some more details too. E.g. is this note on the last page of a book, or just a normal page, etc. The missing note caller makes me guess that there's some kind of difference in the USFM between the working and non-working versions.