I have seen this issue reported with the pro feature cable, and I wanted to start a thread dedicated to serial connections with widebands. In my case, I'm using an Innovate LC-1 connected via its serial output. I have a 2.5mm to USB 232 cable which bypasses the need for a serial-to-usb adapter, but it works the same way. However, I couldn't figure out why I needed to restart my computer with the cable plugged in in order to log AFR. Seemed like something weird was going on, so I kept experimenting. I found the following, and I hope that maybe it could be fixed by HP.
So, the issue seems to be that if I plug the wideband in AFTER plugging my MPVI2+ in, VCM scanner won't recognize it. Logworks (Innovate's software) picks it up, but not VCM Scanner. If I simply unplug the MPVI2+ and plug it back in, it works. Alternatively, resyncing the interface in VCM scanner works as well. This just seems silly that VCM Scanner will not pick up any other serial device automatically. It only searches when it detects a newly connected MPVI2 device or you tell the software to resync manually. Is there a way this can be fixed in a later beta? It's not a bad workaround, but if my usb cable comes loose, I have to resync each time. It just would be nice to have a more plug-and-play workflow.
Anyway, if anyone else has this issue, just resync interface or unplug your MPVI2 and plug it back in (with your serial wideband already connected to the computer.