Does this happen when you run the client in the debugger, our outside? If inside, does the IDe show any exceptions (in VS you might have to turn on to break on all exception types, because some are ignored silently, by default).
What version and platform of Remoting SDK do you use? .NET or Delphi?
I saw this issue when I’ve used Delphi 11.x in VMWare virtual machine: VCL controls (like TComboBox or TMemo) weren’t initialized correctly. it was unstable issue and it wasn’t related to our components so I have ignored it.
It was solved for me with full rebuild of application.