I'm currently running QMC2 v0.186 on openSUSE Leap 42.2 with MAME 0.186. I'm currently trying to set up a CHD hard drive which already has GS/OS 6.0.4 installed using the Apple IIGS (ROM03) emulator, but when I go to QMC2 and change the slot option for one of the expansion slots to the Apple II SCSI card, I'm not getting an entry in the Device Mapping tab for any sort of hard disk drive. Furthermore, even if I save the configuration with the SCSI card in the expansion slot, when I change to another system in the machine list, when I return to the Apple IIGS entry, the SCSI card is no longer associated with the expansion slot I assigned it to.
I was able to get this working in previous versions of QMC2. Am I missing something? Has the behaviour of QMC2 changed recently with respect to slot options and the associated device mapping?