Well, as I see Borislav is running out of ideas, I will throw mine away <g>, although I know is a long shot. Is by any chance your table in a DataBase? Does this database has some event handlers? In particular any code in either After or Before OpenTable?
"The five senses obstruct or deform the apprehension of reality."
Jorge L. Borges?
"Premature optimization is the root of all evil in programming."
Donald Knuth, repeating C. A. R. Hoare
"To die for a religion is easier than to live it absolutely"
Jorge L. Borges