I'm learning how to use Retopoflow 3.0. I've found that after exiting the tool by pressing the
tab key that there seems to be no way to activate the tool again and resume editing my retopology mesh from the point where I left off - so it looks like you have to do your retopology all in one shot. This makes it hard to deal with sculpt errors that you don't notice until you're well into your retopologizing job.
Am I wrong? Is there a way to continue from where you left off?