I was attempting to update ONLY the DiscID for "The Alarmist" (043396-034976), and for some reason Profiler thinks I'm also attempting to update cast information (I am not):

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The contributed profile contains cast or crew entries with birth years that have not yet been accepted. Unless checked below, they will not be included in the submitted profile.

Submitted birth years must serve to distinguish between otherwise identical cast or crew members credited in this or another profile.

To include the birth years, select each below and include a supporting note in the Notes section above.

These birth years have not yet been determined as necessary and should not be submitted unless they are required to distinguish between two otherwise identical cast or crew. Submit these only if you have included specific information about both actors. If you're not sure, just leave these unchecked and submit your contribution.

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What to do?

To expand on what Silence said, Profiler will assume you are updating anything that is different from the online version of the profile.  So, while you aren't trying to contribute the cast, because it is different, Profiler 'thinks' you are.  The solution, as Silence points out, is to not check the box next to cast...or any other data field you don't want to contribute.

Quoting lasitter:

Quote:
OK, my bad. I tried to update a DiscID that didn't need updating, so the DiscID checkbox was never presented -- only the cast. But I didn't change anything about the cast to my knowledge, either.

My guess would be a BY, which got added to your local database at some point. Maybe an update from another profile or from a Headshot.