Thank you for your bug report and assistance with resolving the issue.
This was a rather difficult bug but with your help we were able to quickly get it resolved.
This issue was caused by a compatibility issue with mod_sftp server, we have resolved the issue and it is now fixed in the current development build which can be downloaded from
https://oss.azurewebsites.net/testr/dev-bu...4.2.5.1801.zip
This fix will appear in the next stable release once we have finished testing the changes.