Rex,

The select must be leaving the classlib open in another work area. You can verify that by doing a Window/Data Session menu command and seeing if it's there. If so you might try somthing like:

use TheClasslib.vcx in 0 alias classlib
select ... from classlib NOFILTER
use in classlib

>This is exactly what I am doing and all is well until I close the builder window. The next time I invoke the builder, I get the file in use message. I have tried to SET CLASSLIB TO and RELEASE CLASSLIB, but to no avail.