Set-RDMCurrentDataSource : Object reference error when starting PowerShell (RDM CmdLet)

Using:
Remote Desktop Manager Enterprise
13.5.6.0 64-bit


If I run RDM from one machine the PowerShell (RDM CmdLet) opens fine.
On a second machine the PowerShell (RDM CmdLet) opens but then displays the following error message:


Set-RDMCurrentDataSource : Object reference not set to an instance of an object.
At line:6 char:1
+ Set-RDMCurrentDataSource -ID "91c7xxxx-xxxx-xxxx-xxxx-xxxx3e30b83e"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-RDMCurrentDataSource], NullReferenceException
+ FullyQualifiedErrorId : System.NullReferenceException,RemoteDesktopManager.PowerShellModule.SetRDMCurrentDatasourceCommand


Both installations are connected to the same shared cloud database with the same user and account.
Both machines running Windows 10 Pro 64-bit.

That ID doesn't match the Data Source ID found under File > My Data Source Information.

Running
Update-RDMUI

produces the following error message:


Update-RDMUI : Object reference not set to an instance of an object.
At line:1 char:1
+ Update-RDMUI
+ ~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Update-RDMUI], NullReferenceException
+ FullyQualifiedErrorId : System.NullReferenceException,RemoteDesktopManager.PowerShellModule.UpdateRDMUICommand


Am I missing something?

Jamie