This is not a problem with Imgburn, but from 10-15 hours hunting around the net, it could be an issue for a few others out there, including Imgburn existing users and new converts (like me). The Imgburn forum seemed the best place to raise it, as it's thanks to Imgburn logs and functions that I've narrowed it down as much as I have.
I have an LG BD-RE BH10LS30 DVD drive on Windows (Win 7, but seems this problem goes wider than that). "All of a sudden" I can't burn anything - can read fine, but writing is not possible. Tried several DVD authoring / burning / blank disc permutations.
The clue I have seems to be the log when I start up Imgburn, because it tells me "CreateFile Failed; Reason: Access is denied .... You need Administrative privileges to use SPTI".
The things I have tried are:
1. Upper and Lower filters in Regedit - there aren't any.
2. Created new accounts, normal user and new admin user - no dice.
3. Secpol.msc - changed "grant access to CD/DVD drive to active user only" to Enabled, as recommend on a few forums
4. Reset DMA as per Imgburn FAQ, apparently there is no DMA to reset on my machine (its purely SATA, no IDE)
After beginning to suspect the hardware I finally disproved this, as by switching to ElbyCDIO under Imgburn I/O settings, I can indeed burn a DVD.
It's taken me a day and a half to get this far, even an hour's call to Microsoft didn't help. I found the SPTI error a few times on the net, but always either with one of the solutions above, or ... without a solution.
By the way, the thing which might have changed "all of a sudden" was using Nero 10. I remember some kind of notification about "burn rights". I have subsequently removed Nero (no mean feat, using Revo Unistaller), and will not be going back there again.
One final measure is that I have done a fresh (upgrade) install of Windows.
Does anyone have any thoughts, please?