Hm.... maybe I'm doing something wrong, but that doesn't bring me the dotted lines back.
I create a gmask (auto tangent on, so that I have dotted lines). Then I hit Space+B, click the vertice, and the tangents 'disappear'. In break-mode, I click and hold the vertice and drag out, to extend the tangents again (they are now a solid line). As soon as let go of the tangent, and go back to move mode, I now move the left tangent separate from the right. And now I'm not able to get the dotted lines back....
Smoke 2012 SAP2 SP4
and
Smoke 2013 SP2 (Smoke Classic Keyboard Shortcuts)
Mac Pro 4,1
OS X 10.6.7
12 GB RAM
NVIDIA Quadro 4000
14 TB RAID (Areca)