No, I made no changes at all. This db runs just fine on Win7 Access 2013 64-bit. So it shouldn't make a difference where the DAO statement appears, because I haven't changed it. If I try to open the exact same file with no modifications whatsoever under Win10 Access 2016 it crashes. Just gone--no error message, nothing--Access just disappears from the screen.
So did Microsoft make some change in this?

Thanks for the comments on visibility of buttons.

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Reply from Alex Hedley:

It might be a bug in 2016. Is it patched and up to date?

Which version of MSSQL are you connecting too? It should be able to handle most.
Do any of the other connections to SQL server work?
Could you create a demo ms access db that connects to see if that has an issue

Might be worth

Dim db as DAO.Database
Set db = CurrentDb
Dim rstLogin As DAO.Recordset
Set rstLogin = db.OpenRecordset(...)

You don't have
Option Explicit on?