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?!
Hugh CarterAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Hugh CarterAuthor Commented:
Found the problem.  ODBC driver corrupted in some way!  Re-installed and all ok.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.