I have a table of valid keyvalues called "keys" in my database "skaset". When adding records, I open the keys table with this:

IF !USED("keys")
    USE skaset!keys IN 0
ENDIF

but if it has already used and later is closed, it sometimes (with a certain table) gives me "Error 3 - file is in use". How can I be getting that error? The debugger says that USED("keys") = .F. when I get the error. Is there a problem with opening, closing, and opening a table again?