scp: RA_SCP called with invalid options

We have previously configured and successfully copied files from (AIX ) to Windows with RemoteAnywhere installed, using the following scp command without a password:

scp -B -v Workload2.txt userA@WindowsServer:/D/PutFileHere

The scp command has stopped working, verbose output contains this error:

debug1: Sending command: scp -v -t -- /D/Inetpub/ftproot/LDPS
scp: RA_SCP called with invalid options.

ssh is working fine, even sftp is working fine too

Any tips, hints or suggestion are much appreciated

What happens when you don't specify the "-B"?