Are you using a vertical app like Architectural Desktop? It overrides dimscale with a reactor, even in the object enablers. (or at least the enablers used to, I now purge all AEC dictionaries with my startup routine to avoid that kind of crap).
In ADT you can turn off that override feature in new drawings:
From the Format > Drawing Setup menu
Select the Scale tab
Uncheck the "Automatically Create Dimscale Override"
Check "Save As Default"
However existing drawings need to have this done for each one, as the setting is saved in a dictionary & called by the reactor. I've got some code to do that automatically, but it's at home. Let me know if you need it.
Dan