Great question to be sure I'm not pointing two applications to the same device :)
A easy mistake to make for sure, but no.
I opened FLDigi and ran it without direwolf running to see if it would key PTT any different, and it did
The two applications are not run at the same time.
I'm trying to run YAAC with Direwolf as a KISS TNC interface but without PTT working in Direwolf it's kind of pointless
And yes, I'm very sure FLDigi was dropping PTT when "Tune" was turned off (not green).
I tested it twice.