This was in At the End of the Day, which is the biography of the Blaze Bayley Band, covering Blaze from the Wolfsbane days up until Promise & Terror. If I recall correctly, the roadie in charge of the stage monitors refused to change the monitor setup from the way Bruce liked it. For whatever reason, that positioning didn't work for Blaze at all, and meant there was one spot onstage where he could hear the guitars to help him stay on key. That spot was pretty much right in front of the drum riser, which, if you've seen any boots from the X Factour, that's where Blaze spends a fair portion of the set.
This wasn't fixed until the Virtual XI tour when Blaze got some in-ear monitors, and hence, became a LOT more mobile during the show and his singing overall improved as well, IMO. I don't remember him saying whether he brought up this little feud to Steve and/or Rod or not, but since it went unresolved throughout the entire tour, I imagine he either kept it to himself or Steve/Rod ignored it.