If you attempt to sign in with an RPI client application that uses one or more DLL files with a different version to that installed on server, a message is displayed at the Sign in dialog:
'One or more loaded assemblies are incompatible with this version of the RPI client application. Copy details to clipboard to view the list of assemblies.'
The following is copied to the clipboard:
‘The following assemblies are incompatible with the RPI Client version (v[w].[xx] (Build [yy])):
[For each DLL]:
[DLL name] [w.xx.yy.z]’
You need to close and restart the client application to sign in, even if having replaced the DLL files at fault.