5.11 Community Files - Monster Manual 3

[Greylin]

Hi, our party portfolio kicks out a number of Monster Manual 3 errors:

Critical information not found in data files: Source 'Monster Manual 3'

These don't prevent Community and .user files from loading so I'm ignoring for now. But I don't see anything in the 5.11 changelog that suggests MM3 was adjusted.

Does anybody know what what might have changed in MM3 with 5.11?

I suspect it has to do with party familiars or warhorses - although I don't think there is anything non-SRD in the party which is why I'm bemused by the MM3 errors.

I tried a simple 'delete all familiars and companions' and that didn't fully clear the errors.

Does anybody have any ideas what might have changed in the past 6-12 months that might trigger this MM3 error?