I purchased a 25 pack of Sky 4X DVD-R from YesBuy and have burned three to date. All burned ok and play on both my Sony and cheapie DVD players. Only problem is they only burn at 2X on my LG GSA4040B burner using Nero 6.00.23. The DVDINFOPro data is:

Media Information
Region information N/A not a DVD-VIDEO
Media code/Manufacturer ID AN31
Format Capacity Not Formatted
Free Blocks 411107328
Free Capacity 4.38GB(4.71GB)
Book Type DVD-R
Media Type DVD-R
Media Id Code Speed Unknown
Available Write Descriptor CLV 2.0x 2770KBps
Write Strategy Speed 4.0x 5540KBps
2x Speed OPC beta 0B
2x Speed OPC power 10
2x Write Strategy field 1 11 87 78 80
2x Write Strategy field 2 88 80 00 00 00 00
4x Speed OPC beta 06
4x Speed OPC power 17
4x Write Strategy field 1 0D 0F 0B 0B
4x Write Strategy field 2 98 08 0F 0B
4x Write Strategy field 3 00 00 00 00
4x Speed OPC beta multi-pulse 06
4x Speed OPC power multi-pulse 1C
4x Write Strategy field 4 13 A8 88 65
4x Write Strategy field 5 98 9A 88 80 00 00
4x Write Strategy field 6 00 00 D0 00 00
Data area starting sector 30000h
Linear Density 0.267um/bit
Track Density 0.74um/track
Number of Layers 1

Any thoughts on why they will only burn at 2X?