Okay, for grins, I tried to access the MC200 via Internet Explorer rather than Firefox. It launched a window noting the site was off line with the option to connect or work off line. I hit connect, and the web page opened. So then I tried ControlPC again, and wonders of wonders, it opened! So we're back ripping disks again. Have no idea if anything I did (including rebooting the desktop a couple of times) had any effect. Not the most user-friendly bit of hardware, but that seems to be Meridian SOP.

Main: 861v8, 818v3, 8000XE, 7200HCUSE, 7200.2, Roon Nucleus+, Shunyata Everest w/ Sigma XC and Alpha NR's, HD621, Oppo 103D, Panasonic P60ZT60 plasma. RJ45 switch on master SpeakerLink lines to select 861 or 818, Etherregen & ENO AG feeding the 818, M-Links.
Room #2: 5200.2s from M218.