Testing Serv-U 6.2.0.1 with VBP 6.1 on Windows 2000 SP4, we were able to do a recursive, non-synchronized synchronous put. We did identify a problem in the FTP action when performing a synchronized, recursive put or a recursive get from/to that server. The main download at
http://www.kinook.com/Download/VisBuildProEval.exe has been patched with a fix for the issue (VisBuildNet.dll 6.1.0.1).