I deeply appreciate the work people have done to revive blackbox on Windows. I just downloaded Mojmir's 1.18 RC3 and I'm absolutely loving it.
I'm running on Win8.1 - so far no real issues. I had to use regedit to update the HKEY_LOCAL_MACHINE shell entry, but that's straightforward and I haven't seen any windows UI nonsense since then!
My old .rc files from bblean work perfectly. Had some different behavior on the bar vs. what I was running previously, just because I didn't remember that there's an .rc file buried in the plugins directory that had slightly different defaults than my old one.
I'm a long-time blackbox and fluxbox user in linux, finding myself using windows for gaming and some work-related apps that are unpleasant in linux. With bbZero + cygwin, the pain index is now below tolerance threshold!