here is a copy of the log file from the last burn i did. it is from 1.2 but the image is the same the disc also has a problem at 50%.
I 22:54:11 ImgBurn Version 1.2.0.0 started!
I 22:54:11 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2)
I 22:54:11 Initialising SPTI...
I 22:54:11 Searching for SCSI / ATAPI devices...
I 22:54:11 Found 1 DVD-ROM and 2 DVD?RWs!
I 23:03:48 Operation Started!
I 23:03:48 Source File: D:\DVD IMAGES\*******.iso
I 23:03:48 Source File Sectors: 4,130,302 (MODE1/2048)
I 23:03:48 Source File Size: 8,458,858,496 bytes
I 23:03:48 Source File Application Identifier: MKISOFS ISO 9660/HFS FILESYSTEM BUILDER & CDRECORD CD-R/DVD CREATOR © 1993 E.YOUNGDALE © 1997 J.PEARSON/J.SCHILLING
I 23:03:48 Source File Implementation Identifier: mkisofs
I 23:03:48 Destination Device: [0:0:0] LITE-ON DVDRW SOHW-1633S BS0Y (F:) (USB)
I 23:03:48 Destination Media Type: DVD+R DL (Disc ID: RITEK-D01-01) (Speeds: 2.4x)
I 23:03:48 Destination Media Sectors: 4,173,824
I 23:03:48 Write Mode: DVD
I 23:03:48 Write Type: DAO
I 23:03:48 Write Speed: 2.4x
I 23:03:48 Link Size: Auto
I 23:03:48 Test Mode: No
I 23:03:48 BURN-Proof: Enabled
I 23:03:55 Optimal L1 Data Zone Start LBA: 2071504 (VTS_03, PGC: 1, Cell: 61)
I 23:03:55 Optimal L0 Data Zone Capacity: 2,071,504
I 23:03:55 Optimal L0 Data Zone Method: IFO Cell Boundary, 'SPLIP' Flag Not Set
I 23:04:32 Filling Buffer...
I 23:04:33 Writing LeadIn...
I 23:04:35 Writing Image...
I 23:04:35 Writing Layer 0... (LBA: 0 - 2071503)
I 23:25:39 Writing Layer 1... (LBA: 2071504 - 4130301)
I 23:46:36 Synchronising Cache...
I 23:46:37 Closing Track...
I 23:46:38 Finalising Disc...
I 23:47:39 Operation Successfully Completed! - Duration: 00:43:50
I 23:47:39 Average Write Rate: 3,278 KB/s (2.4x) - Maximum Write Rate: 3,412 KB/s (2.5x)