Ricardo,
Thanks for the info. The site still uses ICC so no EVO anywhere.
Out of curiosity, I ran a query of the Modifications table looking for 'HISTORY' in the parameter field. To my surprise, it came up with nearly 28000 results (and that's only since early 2016). It appears that -- for the most recent occurrences, at least -- that .HISTORY.ENABLED is changed wholesale from ENABLED to DISABLED when we perform a LoadAll of compounds.
We'll explore filing a case with GCS as you suggested.
Thanks!
Duc