Which Visual COBOL version are you using?
Is it Visual COBOL 2.1 update 1 or an earlier release?
If you are using VC 2.1 update 1 then you should really create a support incident with Customer Care and report this as a bug so that we can reproduce the problem and make sure that the problem gets fixed.
If you are using a release prior to VC 2.1 update 1 then you should try to upgrade to VC 2.1 update 1 and see if the problem has been resolved.
Thanks.