Hmm. It turns out, having just repeated some experiments, that maybe the LEDs really don't have anything to do with it. Even with the LEDs off now I am seeing missed interrupts. I cannot explain why the earlier experiment gave the opposite result. Was that just a fluke?

I've also re-confirmed that my player doesn't ever drop interrupts. The differences between Paul's players and mine are that his have 160GB vs 60GB (non-related, surely?), and that his is running v2 final whereas I'm running v3a7. Both have the same hijack version (v394). Oh, mine has 64MB RAM, his 48MB.

Could it be a software issue? I don't think so. Trevor, what are you running?