Ok, I found the cause.
I had previously been combining the final $crlf with the last sockwrite line using $+ rather than as a separate line. This worked fine in 6.35, but apparently won't work anymore. With a separate line added for the $crlf (or just a blank -n line), it works fine.
So this isn't a bug and the way I was doing it before was probably just luck that it worked as it probably wasn't intended to work that way. That said, I've seen others use the same methods and if there isn't a reason not to allow it, I think it might be better to maintain that ability rather than forcing any scripts that had used that method to update. Up to you though. I'll change them anyhow just to make them "correct."
