Quoting issue from ODBC

Front end: Access 365
Back end: Postgres 9.4
(I know, we are in the process of upgrading)

I'm getting some cases where the SQL sent from MS-Access is failing.
Looking at the postgres log shows that the field names and table names are
not being quoted properly.
It has been my experience that Access usually does a better job at
converting the queries than I would have expected, but not in this instance.

For example

Access: connection.Execute "UPDATE [" & strTable & "] SET [" & strTable &
"].[InsertFlag] = Null" _
& " WHERE ((([" & strTable & "].[InsertFlag])=" & lngCurrUID & "));", ,
adCmdText Or adExecuteNoRecords
Note that InsertFlag is bracketed the same way in both instances.

PSQL: UPDATE "public"."Orders" SET InsertFlag=NULL WHERE ("InsertFlag" =
166 )
Note that InsertFlag is quoted once but not the other time.
Of course this gives the error: column "insertflag" of relation "Orders"
does not exist at character 35.

Looks like I have about 16 unique instances of statements not being quoted
correctly resulting in over 500 errors in the log for today.

Any suggestions on where to look?

Thanks,
Brad.