Selecting data from SQL Server to Access using a stored procedure returns non-visible characters

MS Access 2013
SQL Server 2014 Std

I have suddenly got a problem when retrieving data from SQL Server 2014 in to MS Access 2013 using a Stored Procedure.
When I try to retrieve data using any stored procedure the procedure is called and data is returned.  The length of the string returned is exactly what it should be but the string itself doesn't show "real" characters.

If I simply run a "standard" SELECT then data is returned normally.  Only data selected using a stored procedure is "faulty".

I've tried rebuilding permissions on the stored procedures.  No change.
I've cloned a procedure in to another database running in the same instance and I get the same result.

I recently changed the ODBC driver to ODBC Driver 11 for SQL Server but that was a few days ago and all worked well.

A temporary Schema was removed a couple of days ago and this resulted in a failed function so I did recreate the schema at about the time these problems started.  Removing the schema again does not seem to make any difference.

If I run exactly the same selects in management studio I get "good" data.

Any bright ideas how to find the problem?!
LVL 1
Hugh CarterAsked:
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Hugh CarterAuthor Commented:
Found the problem.  ODBC driver corrupted in some way!  Re-installed and all ok.

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