I bought a 20 pack of Maxell DVD-R 4x discs from Staples Business Depot in Canada. They have a blue surface and a yellow top. They say "Made in Japan" on the back, if that helps.
I tried 5 or 6 from the pack and I get the same result when trying to burn with Nero. It says "insert a blank disc into the drive" and ejects the disc. This was using a BenQ DW1620. I also put one in my Lite-On DVD-ROM drive to see if it would recognize it, but it also didn't see a disc in there.
I got the 20 pack for $18 so I guess you get what you pay for.
Anyone else have problems with them?