Upgraded to 3.7.9 with Yaesu 857d. I have CAT control and PTT will light up transmitt indicator but no power is transmitted. Using 4.6.2 VARA HF and system works with Winlink VARA HF putting our power at same correct settings.
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SUCCESS! Checking the PTT side DTR/CTS and leaving the FREQ control with CAT it worked!
Perhaps ft857 does it like my ft847: When you give PTT over CAT it doesn't modulate from Data-In-Out connector -> no HF power in SSB without modulation. My 847 wants PTT (from RTS or CTS pin) on Data-In-Out connector and of course varac must be configured to make ptt over RTS - still the same com1 is allowed for both, CAT (eg. frequency control) and RTS pin (ptt). I often had my ft847 with "no HF power although sound is produced" (due to missing PTT on the same connector)