It seems that after updating Vista x64 to SP1 it may have broken the "Change Book Type" function in Imgburn.
Before updating Vista x64 to SP1 I was able to change the book type for my Samsung drive.
After installing SP1 when I select the "Change For:" it gives the following message under "Current Setting:"
Unknown (FAILED!)
Reason: Incorrect function.
This is the case for both DVD+R DL and DVD+R Media, media for which I used to be able to change the book type.
Drive Type:
TSSTcorp CD/DVDW SH-S183L SB01 (ATA)
Log file:
I 17:26:33 ImgBurn Version 2.4.0.0 started!
I 17:26:33 Microsoft Windows Vista Ultimate Edition (6.0, Build 6001 : Service Pack 1)
I 17:26:33 Total Physical Memory: 6,289,596 KB - Available: 4,999,748 KB
I 17:26:33 Initialising SPTI...
I 17:26:33 Searching for SCSI / ATAPI devices...
I 17:26:34 Found 1 DVD-ROM and 1 DVD