Caution!
I did the latest GROM VLine 2 firmware update on 4/15. Everything looked good, but after reboot, the VLine disappeared. I didn't think much about it, and figured that it would reappear on the next vehicle start.
I got back into the car a little later and the OEM navigation screen was a blank black screen, as was the backup camera screen. HVAC, OEM audio, Display and Info continued to work as normal. I unplugged the VLine2, and same thing, I was starting to think maybe the OEM navigation system had finally gone bad. I went and dug up my old VLine1, just to do a sanity check and SOB everything works just fine. Currently working with GROM support to try to unbrick the darn thing.
Update 4/23: VLine2 unbricked with a special file loaded to a USB, and a special hokey pokey dance.