We’re getting more information on that note from the jury David noted below. The jury asked the judge what they should do if they “cannot come to a consensus for a single” count and if they can’t what does that mean for the “final verdict.” This strongly suggests (though who knows?) that they have reached consensus on most or all of the remaining 17 charges. They’re hung up on a single charge. In other words, they’ve made a lot of progress. We’d now expect the judge to ask them to take more time and try to reach consensus on that final charge.
There’s some ambiguity that some have noted that perhaps the jury meant they can’t come to agreement on even one count. In other words, they’re totally hung. That seems like a strained reading of the note. But it’s just a couple sentences and the version of the text we have are what reporters heard in open court, not reading the actual note. Seems like the former, but who knows.
Update: Some more news out of the courtroom appears to confirm that this is about lack of consensus on a single charge.