I contacted Fortec Star Tech Support by email, and have exchanged some emails with a helpful rep in Toronto.
He asked me to switch Inputs One and Two and report back.
Since that ended up changing the situation, I decided to try various different LNBFs in various different ports, and I found one combination
that allowed all four LNBFs to work:
1 - Circular LNBF (which has no 22k aspect)
2 - Universal LNBF
3 - 22k switch with two Standard LNBFs
4 - Terminator
HOWEVER, the result was that on some channels, it now takes 10-15
seconds for the channel to be tuned (as opposed to less than 1 second
previously). Other channels work normally. On some channels, the
signal quality shows zero, a "No Signal" banner pops up, and THEN one
or two seconds later, the channel is tuned in and the signal quality
shows a more normal reading.
Any thoughts ? (I should hear back from Fortec tomorrow about it, but though someone here might have some insight or experience on this.)