Theoretically, though, that shouldn't make any difference. The standard upgrade process just downloads the ESD and then performs the upgrade. Other than converting to ISO and mounting it manually, you've done nothing meaningfully different. In fact, you've introduced another chance for error.I didn't format or clean install, I just used the CD "upgrade" method of 14342. I grabbed the ESD, converted to ISO, mounted it live and installed from there. Both times I used the standard upgrade through win update, this build got hosed. LOL All other times I've done this has worked.
So maybe you've just suffered from some kind of weird coincidence. But ultimately, I stand by my position that Microsoft has a lot of work to do by the end of July.