I am having kind of the same error, I am using the correct disc's verbatim 2.4x made in singapore... here is a copy of my log file... I have had no problems until recently... these are a new pack of discs, but I also use this burner a lot so I'm not sure what it could be
Here is the log
I 22:27:41 ImgBurn Version 2.4.0.0 started!
I 22:27:41 Microsoft Windows Vista Home Premium Edition (6.0, Build 6001 : Service Pack 1)
I 22:27:41 Total Physical Memory: 3,143,120 KB - Available: 2,311,932 KB
I 22:27:41 Initialising SPTI...
I 22:27:41 Searching for SCSI / ATAPI devices...
I 22:27:41 Found 1 DVD