Where are you getting the "slightly off" value from... The readout in the upper right is a rounded approximate number. If you actually clcik that field to open the edit/entry dialogue, then the actual numbers appear?

"""""""""""Some notes:
I did have multiple instances of MoI open on the same machine. The file history is also incorrectly failing to list the last files open in some of my instances, so perhaps there is something going on here as well?"""""""""""

That file access history is written to the MoI ini file upon exit of the application.. With multiple instances open, you may get writing, re-writing of these fields appear odd? See if thats it.