We've recently found a bug in the RC 3.0.8 when using libraries downloaded with initial versions of Update Manager. Until we fix it, please download all your libraries again, in the following way:
1) Delete all content under C:\Users\<your windows user>\AppData\Local\Itoo Software\RailClone Pro
2) Remove the following registry key (by using the regedit.exe or by the attached .reg file): HKEY_CURRENT_USER\Software\Itoo Software\Update Manager\Packages
3) Open the Update Manager (Start menu->Itoo Software->RailClone Pro->Update Manager), and download all necessary libraries.
That should fix the problem. It's not necessary to update the content in render nodes, because problem affects only to the Library Browser.
We apologise for any inconvenience.