That kind of makes it worse, LOL. It means incomplete testing after changes at the very least, unless of course Canon USA does not want anyone to register a 100-50, which seems unlikely.
I was able to register my 100mm Macro without issue, as well as my camera and the lens it came with, so this kind of surprised me. I like Canon products a lot, but this is pretty ridiculous. From the perspective of having had a job where some of what...
Is there a ticket open on this or anything we can track externally? I just got the same lens and found this post after also failing to register it. Of course, I will save my receipt and whatnot, but I like to register my lenses right away. Thanks!