Some more quick info on this problem.

I just tried the app using IBX with simply swapping the database to a
TIBDATABASE and a TIBQUERY and the problem has disapeared.

So it looks like the TIBOQuery/TIBODatabase.

BTW for any one familiar with DevExpress Grids the grid is being used in
PartialLoad mode where it loads 200 records into its buffer.

Thanks.