I know there's been posts about this before, and I myself have actually posted about it before, but I figured this warrents a new topic now that I know for certain.
The problem is, that when you use synchro record from a digital source with a N910 it doesn't stop recording when the source does, and just continues recording nothing until it is stopped (either automatically after 5 minutes or manually by hitting stop).
I got in touch with the place I got mine from (EmpireDirect.co.uk) who - after sending me a replacement model - put me in touch with an engineer. He then got in touch with Sony and relayed to me the message that yes, there is a fault with the units (at least, certainly with all the European ones.) The reason I was given for this is because the "previous model" (the R910 I assume?) didn't have synchro recording, so that caused some problems.
Apparently there may or may not (emphasis on the latter) be a fix for the bug in the future which could be done via the USB link.
A bit of a bugger really, because it stops you using the whole 79min 59secs of a disc if you have to do TOC edits to get rid of the space on the end when recording from an optical lead. Oh well, at least you can pull it off using a line out.
Anyway, I just thought I better post this to try and clear this up. It's still my favourite MD recorder on the market.. even if it doesn't.. umm.. record properly :?