>My main.prg sets the path to LIBRARY subdirectory (which contains the main.vcx library) before calling my classes.
>Most of the time the main.prg runs fine and I can instantiate my classes from the main.vcx properly. But sometimes I get an error :
>
> main.vcx can not be found.
>
>I am using 5.0a version.
>Maybe this is a bug on 5.0a version?
>Any clue on this problem.?
>
>Thanks,
>Sergio

SET LIBRARY TO overwrites any previous settings unless you use the ADDITIVE clause. Are you sure that you are not issuing SET LIBRARY elsewhere in your app and that is overwriting your initial entry?