Hi Paul,
Sorry for the delay in response.
This requires fix for ‘My webMethods Server’, not ‘My webMethods Platform Manager Plug-in 10.7 Fix 1’
i.e. ‘My webMethods Server 10.7 Fix 1’.
Please refer the screenshot shared.

This should resolve the issue.
UPDATE:
We have identified the same issue with MWS 10.7 Server Fix 1 as well.
Fix for this issue will be available as part of MWS 10.7 Server Fix 2.
If a test patch becomes available, will update this thread.
Apologies for the earlier update.
Regards
Biswa
#B2B-Integration#webMethods#Managed-File-Transfer