I don't know if this may be related or not, but if using this m-gbic in a 20+4 module, it will only work in the lower row -or- upper row, but not both at the same time. See this link:
http://h10144.www1.hp.com/products/accessories/J8177B/accessory.htmMaybe try removing all of these in one of the rows and see what gets reported???? maybe worth a try.
(I realize youare not using this module in the note, but I thought it worth mentioning)
hth...Jeff