I just checked with a secondary, older PC running MC28 (both PCs are on a wired LAN with the HomeRun Primes). On it, I can watch/record all channels *except* the FXX channels (the change cablecards cause no problems there).
So, on my primary PC, MC29 gets no signal on all channels.
On the secondary PC, previously installed MC28 gets no signal on FXX, but the other channels are OK.