Thanks, Bob for responding. Even though I posted this as a separate thread, I was actually hoping it was a clue to another problem I've been dealing with (which you posted on, as well), located here:
https://forums.modx.com/thread/?thread=85749&page=3
I came in to work this morning with three sites exhibiting buggy behavior, all on the same server. One was a complete front end whiteout and the other two had missing navigation menus. I was trying to compare error log entries between the three but couldn't find a common thread between them. The above entry stood out to me and thought I would ask here. Unfortunately there doesn't seem to be any easy way to track if it is a component (all very common tried and true ones on that site by the way). Especially since that error message doesn't provide all that much of a clue.
As a side note, we're looking into a possible solution regarding the other situation involving the server's configuration. Will post findings in the other thread if it proves successful.
Again, thank you for responding so quickly.