MS Windows Network drives fail once SftpDrive connects

I am running windows xp (sp2) and have several drive letters mapped to a debian linux samba server (mine). Every thing runs smoothly in all apps.

When I open SftpDrive and connect to another linux server (work), I run into problems
Browsing the samba connections in explorer.exe works just fine.
Doing a "net use" from the command prompt looks fine for both types of mappings.
From the command prompt I can switch to the SftpDrive mapping just fine.
However, trying to switch to the samba drives from the command propert fails with an error mesage of "The system cannot find the drive specified."

I have verified this on the only two windows xp machines I have installed the SftpDrive trial version on.

Anything further requires a reboot.
After I "disconnect" the SftpDrive, I still cannot access the drive
After I quit SftpDrive, I still cannot access the drive
I can "net use /del [drive]" succesfully, but the drive does not disappear until I reboot.

As another test, I created a drive mapping between my two workstations. This connection works just fine. Note: I was connected to SftpDrive at the time. I disconnected the SftpDrive map, quit, reconnected, and tried to access the XP mapping. It continues to work.

As another test, while connected with SftpDrive, I tried mapping a new samba connection. This worked and I have command prompt access. But the samba mappings which were open first, still do not work. So order matters. Disconnect SftpDrive map, quit, reconnect, and the new samba mapping stops working.

-Terry