And once more........

The only thing changed on my system is - i re-installed ImgBurn 2.3.2.0 and burned a DVD just to test.

Burned fine, verified fine, burner reads it fine. Please see log for reference:

; //****************************************\\
; ImgBurn Version 2.3.2.0 - Log
; Wednesday, 16 April 2008, 23:06:52
; \\****************************************//
;
;
I 22:51:07 ImgBurn Version 2.3.2.0 started!
I 22:51:07 Microsoft Windows Vista Ultimate Edition (6.0, Build 6000)
I 22:51:07 Total Physical Memory: 2,096,064 KB - Available: 1,115,928 KB
I 22:51:07 Initialising SPTI...
I 22:51:07 Searching for SCSI / ATAPI devices...
I 22:51:08 Found 1 DVD-ROM and 1 DVD±RW/RAM!
I 22:51:59 Operation Started!
I 22:51:59 Building Image Tree...
I 22:51:59 Checking Directory Depth...
I 22:51:59 Calculating Totals...
I 22:51:59 Preparing Image...
I 22:51:59 Checking Path Length...
I 22:51:59 Image Size: 3,620,503,552 bytes
I 22:51:59 Image Sectors: 1,767,824
I 22:51:59 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:04 Operation Started!
I 22:52:04 Building Image Tree...
I 22:52:04 Checking Directory Depth...
I 22:52:04 Calculating Totals...
I 22:52:04 Preparing Image...
I 22:52:04 Checking Path Length...
I 22:52:04 Image Size: 4,958,486,528 bytes
I 22:52:04 Image Sectors: 2,421,136
I 22:52:04 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:06 Operation Started!
I 22:52:06 Building Image Tree...
I 22:52:06 Checking Directory Depth...
I 22:52:06 Calculating Totals...
I 22:52:06 Preparing Image...
I 22:52:06 Checking Path Length...
I 22:52:06 Image Size: 3,620,503,552 bytes
I 22:52:06 Image Sectors: 1,767,824
I 22:52:06 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:16 Operation Started!
I 22:52:16 Building Image Tree...
I 22:52:16 Checking Directory Depth...
I 22:52:16 Calculating Totals...
I 22:52:16 Preparing Image...
I 22:52:16 Checking Path Length...
I 22:52:16 Image Size: 4,361,388,032 bytes
I 22:52:16 Image Sectors: 2,129,584
I 22:52:16 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:22 Operation Started!
I 22:52:22 Building Image Tree...
I 22:52:22 Checking Directory Depth...
I 22:52:22 Calculating Totals...
I 22:52:22 Preparing Image...
I 22:52:22 Checking Path Length...
I 22:52:22 Image Size: 4,809,490,432 bytes
I 22:52:22 Image Sectors: 2,348,384
I 22:52:22 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:27 Operation Started!
I 22:52:27 Building Image Tree...
I 22:52:27 Checking Directory Depth...
I 22:52:27 Calculating Totals...
I 22:52:27 Preparing Image...
I 22:52:27 Checking Path Length...
I 22:52:27 Image Size: 4,361,388,032 bytes
I 22:52:27 Image Sectors: 2,129,584
I 22:52:27 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:37 Operation Started!
I 22:52:37 Building Image Tree...
I 22:52:37 Checking Directory Depth...
I 22:52:37 Calculating Totals...
I 22:52:37 Preparing Image...
I 22:52:37 Checking Path Length...
I 22:52:37 Image Size: 4,515,004,416 bytes
I 22:52:37 Image Sectors: 2,204,592
I 22:52:37 Operation Successfully Completed! - Duration: 00:00:00
I 22:52:42 Operation Started!
I 22:52:42 Building Image Tree...
I 22:52:45 Checking Directory Depth...
I 22:52:45 Calculating Totals...
I 22:52:45 Preparing Image...
I 22:52:45 Checking Path Length...
I 22:52:45 Image Size: 4,515,004,416 bytes
I 22:52:45 Image Sectors: 2,204,592
I 22:52:47 Operation Successfully Completed! - Duration: 00:00:04
I 22:52:47 Operation Started!
I 22:52:47 Source File: -==/\/[BUILD IMAGE]\/\==-
I 22:52:47 Source File Sectors: 2,204,592 (MODE1/2048)
I 22:52:47 Source File Size: 4,515,004,416 bytes
I 22:52:47 Source File Volume Identifier: Movies
I 22:52:47 Source File Application Identifier: IMGBURN V2.3.2.0 - THE ULTIMATE IMAGE BURNER!
I 22:52:47 Source File Implementation Identifier: ImgBurn
I 22:52:47 Source File File System(s): ISO9660, UDF (1.02)
I 22:52:47 Destination Device: [1:1:0] LITE-ON DVDRW LH-20A1P KL0N (I (ATA)
I 22:52:47 Destination Media Type: DVD+R (Disc ID: MCC-004-00) (Speeds: 2.4x, 4x, 6x, 8x, 12x, 16x)
I 22:52:47 Destination Media Sectors: 2,295,104
I 22:52:47 Write Mode: DVD
I 22:52:47 Write Type: DAO
I 22:52:47 Write Speed: 8x
I 22:52:47 Link Size: Auto
I 22:52:47 Test Mode: No
I 22:52:47 BURN-Proof: Enabled
I 22:52:47 Filling Buffer... (40 MB)
I 22:52:48 Writing LeadIn...
I 22:53:29 Writing Image... (LBA: 0 - 2204591)
I 23:00:32 Synchronising Cache...
I 23:00:35 Closing Track...
I 23:00:37 Finalising Disc...
I 23:00:55 Image MD5: c20e4a099621625737e83a95d7f9e5ab
I 23:00:55 Operation Successfully Completed! - Duration: 00:08:08
I 23:00:55 Average Write Rate: 10,448 KB/s (7.5x) - Maximum Write Rate: 11,359 KB/s (8.2x)
I 23:00:55 Cycling Tray before Verify...
W 23:01:03 Waiting for device to become ready...
I 23:01:14 Device Ready!
I 23:01:14 Operation Started!
I 23:01:14 Source Device: [1:1:0] LITE-ON DVDRW LH-20A1P KL0N (I (ATA)
I 23:01:14 Source Media Type: DVD+R (Book Type: DVD-ROM) (Disc ID: MCC-004-00) (Speeds: 2.4x, 4x, 6x, 8x, 12x, 16x)
I 23:01:14 Image File: -==/\/[BUILD IMAGE]\/\==-
I 23:01:14 Image File Sectors: 2,204,592 (MODE1/2048)
I 23:01:14 Image File Size: 4,515,004,416 bytes
I 23:01:14 Image File Volume Identifier: Movies
I 23:01:14 Image File Application Identifier: IMGBURN V2.3.2.0 - THE ULTIMATE IMAGE BURNER!
I 23:01:14 Image File Implementation Identifier: ImgBurn
I 23:01:14 Image File File System(s): ISO9660, UDF (1.02)
I 23:01:14 Verifying Sectors... (LBA: 0 - 2204591)
I 23:06:05 Device MD5: c20e4a099621625737e83a95d7f9e5ab
I 23:06:05 Image MD5: c20e4a099621625737e83a95d7f9e5ab
I 23:06:06 Operation Successfully Completed! - Duration: 00:04:51
I 23:06:06 Average Verify Rate: 15,151 KB/s (10.9x) - Maximum Verify Rate: 21,765 KB/s (15.7x)
I 23:06:51 Close Request Acknowledged
I 23:06:51 Closing Down...
I 23:06:51 Shutting down SPTI...
I 23:06:52 ImgBurn closed!

Oh, and i tested the "dodgy" DVD's created by the 2.4.1.0 version - they also read fine in my boyfriend's laptop (combo drive), so i guess they are safe - only my burner still refuses to read those, which is weird.

So there must be a bug in ImgBurn 2.4.1.0 which prevents it to function correctly under Vista 32bit with my particular burner.

I'll stick to this old version now, it asked me during install if i want it to check for updates periodically and i told it "no, thanks".

With kind regards.......

your Thanh