I see this is an old post, but I have same problem, and confirm it happens after selecting the correct make and model during the wizard.
- FlashForge Creator Pro Dual
- The most recent Sailfish firmware provided by FlashForge (via FlashPrint)
- Antergos (updated last week of May)
- MatterControl 1.7.0 (just installed today)
MatterControl is detecting something when it is plugged in, but just can't connect: Auto-detect doesn't work (just keeps saying "Attempting to connect..."). If I do Manual Configuration, it lists one option: /dev/ttyACM0, and if I choose it and press connect, i also just keeps saying "Attempting to connect..." If I do not plug in the printer, it just lists all of the ports (/dev/ttyS*).