We are not sure, if the upgrade on 2008-07-24 Version would help you in this case.
But we believe that this bug should be already fixed in the more recent versions for there was quite a lot of updates since you have bought our component five years ago.
You can see the release history here:
Our suggestion therefore is, whether you could try to update to current version of Rebex SFTP for.NET/.NET CF .
In case this your problem would persist, we will refund you this order.
Please let me know, and in case this solution suits you, I will send you a renewing link to your e-mail.