I'm pretty dialed in with my Stellarmate X. Just a few bugs to figure out. As you can see in the attached screen shot, "UnPark mount" and "Park mount" are both greyed out. I always start out with an unparked mount, so I don't know if it being greyed out would prevent the scheduler from starting. But I always wake up to a mount that has stopped tracking but isn't parked. However, this isn't always the case, but I can't isolate the variable that makes it selectable. I'm on a Stellarmate X with the latest version running the CGX GPS driver.
I may have answered my own questions. I usually do "last align" or "quick align" when I power up my mount. I had done that last night but also plate solved in prep for a session. But then had to power cycle my Stellarmate X. When I reconnected INDI, the unpark and park checkboxes were available. To test the idea, I just now powered up, did a one star align, then connected to INDI. Unpark and park are available.
The driver instructions say:
You must power and align your mount using the handset using any supported alignment method (e.g. SkyAlign). Without aligning your mount first, the driver will not connect to the handset.
I have never had issues connecting to the HC using the GPS driver, even without any alignment. However, it seems that more than a "quick align" or "last align" is needed prior to connecting to INDI.