Oh, and it just seems to be mink, at least everything else I've checked seems okay.

I've just tried searching for both American Mink and Mustela vison using both the MAMMALIA and Recorder 3.3 checklists, and also Neovison vison on the List of addditional names. (5 searches in total). All gave the same total of 306 records, so it's not obviously a problem on our database. (Version AG. Dictionary 3T.  6.25.1.284).

Regards, Keith

SQL in the form of

INNER JOIN Taxon_Determination TD ON TOCC.Taxon_Occurrence_Key = TD.Taxon_Occurrence_Key AND TD.Preferred = 1
INNER JOIN Index_Taxon_Name ITN ON TD.Taxon_List_Item_Key = ITN.Taxon_List_Item_Key
INNER JOIN Index_Taxon_Name ITNr ON ITN.Recommended_Taxon_List_item_key = ITNr.Taxon_List_Item_key AND ITNr.System_Supplied_Data = 1
INNER JOIN Taxon_List_Item TLI ON ITNr.Taxon_List_Item_Key = TLI.Taxon_List_Item_Key

WHERE ITNr.Taxon_List_Item_Key = 'NHMSYS0020774249'

appears to be bringing back records from across all checklists we've used (MAMMALS, Recorder 3, LoAN)

All mink records appear to be displayed when using the report St03.

Just to confirm you do have the Option 'Use translation to Full Term' ticked ?  There have been no intended changes to the way this works, but some other change could have had an unexpected  knock on effect. From the tests you have run your dictionary seems Ok, so the next step is for me to try and duplicate the problem.