Thank you for those links Mike! While they don't seem quite like the issue I am having maybe they are related.
Also, as an FYI, I reran ImageIntegration on all 260 BIAS images at once with the only change of deleting my RAMdisk (so now I had 48 GB or RAM available instead of 32 GB) and it ran successfully, although it was VERY slow. So, evidently, pixinsight was running out of RAM.
For those of us that are working with DSLR's (mines a Canon so, .cr2 raw files specifically) the new version of pixinsight with libraw seems a little more "resource intense", requiring at least a bit more RAM to accomplish some of the same task's that we accomplished with a bit less before. I am by no means a software engineer, and may be way off, but just my observations.
Thanks again, Scott