Before the upgrade I could only go at 1x, now I'm at 2x, the weird thing is that exactly the same files fail (the last half or so to be burnt), changing the UDF file system version or just not using it at all seems to have no apparent difference.
If all else fails, I would probably get away with renaming the files so that the last lot are burnt first, but that would really be a horrible work around a problem that shouldn't exist!
I shall try 1x again over night (I'm quite tired of not being able to use my PC for an hour at a time) to see if I get a more reliable burn. The discs I'm using are WHSmith own brand (hurhur) which have a max writing speed of 2x and a max capacity of 4.7gb.
Does burning a DVD at its 'max' writing speed actually mean you're likely to screw it up? There's not some unwritten law of DVD burning that says 'thou shalt burn at half max speed or incure God's wrath', is there?