Thanks for the follow up.

I'm curious what the cause of the problem is and am hoping that we can be of some help in resolving it.

Did this happen again?  If so, did you figure anything out?

Just happened again to me.  I got a notice that a user I know I'm not following (BOR15K) posted, but it claims I am following them.

I was re-reading the problem and discussing it outside of this thread a little bit, and I'm not sure if the current path that we are following will lead us...

heh... yep... that fixed it.  I changed my fiew to "tiles" and it was fixed so I am expecting it to be the same problem.

I'll schedule a window...

Adding to what Sue_H said, I don't think you can nicely set up a local account (such as NT Service\MSSQLSERVER) with KERBEROS without using delegation.  I think in that case...

I had this happen to me a few times too.  One time it was a spam bots post that it claimed I was following.  I still have copies of the...

Good thoughts with that Thom.  SQL Injection, while unlikely in a NVARCHAR(19), could occur.  Your solution does eliminate the risk involved of SQL injection.
I suppose if you knew that...

I could be wrong, but I think you will need to build this as dynamic SQL.  That is:
DECLARE @query varchar(255)
DECLARE @comp_cod nvarchar(19) = N'2,3'
SELECT @query...