Same problem here. I have 2 Stellarmate systems and one Astroberry system - all up-to-date with apt-get update and apt-get upgrade. U-blox 7 GPS receivers worked until a couple months ago. No data with the indi control panel - cgps shows no data - gpsmon /dev/ttyACM0 shows all the data.
I don't see a place to specify the port in Indi. My USB hub is a 7 port hub RPi hat from Geekworm. I would prefer not to have to dismantle the package and use a different USB hub. I have years of Linux experience but only as a user. If there is a workaround command to start a service in a terminal, I can follow instructions. But I hope there will be a solution to get back to the plug-n-play operation we had previously.
Any suggestions? Is there a workaround solution? Will a future release likely have a solution for this problem?