Invalid access to memory on Windows Web Server 2008 R2

Getting this randomly but continuously with program just sitting idle after successful connection and file transfer.

WinSCP - Version 4.3.2 (Build 1201)
Windows Web Server 2008 R2


. 2011-03-23 10:25:43.809 Session upkeep
. 2011-03-23 10:25:44.324 Session upkeep
. 2011-03-23 10:25:44.838 Session upkeep
. 2011-03-23 10:25:45.353 Session upkeep
. 2011-03-23 10:25:45.868 Session upkeep
. 2011-03-23 10:25:46.383 Session upkeep
. 2011-03-23 10:25:46.898 Session upkeep
. 2011-03-23 10:25:47.334 Connecting to www(removed) ...
> 2011-03-23 10:25:53.606 REST 0
. 2011-03-23 10:25:53.621 Getting current directory name.
< 2011-03-23 10:25:53.637 350 Rest supported. Restarting at 0
> 2011-03-23 10:25:53.637 PWD
< 2011-03-23 10:25:53.684 257 "/" is current directory.
. 2011-03-23 10:25:53.684 Got reply 1 to the command 16
* 2011-03-23 10:25:53.730 (ECommand) Error getting name of current remote directory.
* 2011-03-23 10:25:53.730 Invalid access to memory