Thanks for the reply. I still believe this is a bug, and here is why:

-I've tested it with the "Use Auto Length as Entered Length" box unchecked, and it works as you've described. 

-My "Machine if Length <" value also needed to be changed and it seemed to work for the duct with TDF / TDC connections.

However, our coil line does both TDC and S & Drive connections (56" joint length vs 59"). Setting the "Machine if Length <" value to 56.xx makes a 57" long duct with  S & Drive connections Decoiled Straight, which would obviously be machine cut.

Luckily only a few machines have installed .2, we are holding back on this update until Autodesk fixes the issue, or I find an alternate solution that doesn't require scripting. Our shop's script would catch and fix the issue, but our estimating & other departments do not, and this is not  a good enough reason for me to implement that extra step for them.

Once again, thanks for your reply.