>Yes they are created with create cursor the sql command. I find the program has problems when when I use the requery method for the two list boxes. For a while, they both requery fine, but after moving list items between the two boxes, I get an index internal inconsistency error and an Internal resource manager error. Could these errors possibly be caused by disk space or insufficient memory even though I have plenty of disk space and memory?

Try to unlink list (Rowsource="") right before your recreate its cursor, and link it back right before Requery.