I'm sure that this isnt noteworthy but I kept getting the above error on my 7100 and 7600 upstairs in the attic. Turns out that both Shared Library and Shared Library PPC needs to be on. I figured it out finally bc 7.5.3 on my LC 575 gave the error but mentions an OT extension not loading, after installing a new Blue SCSI SD that came from my LC 550. I put two and two together and realized both shared libraries need to be on. Unreal, this was driving me nuts for a solid month!