Hi,
I'm sorry to hear you're facing these troubles. Please double-check, that there is the same version of the plug-in installed (might be, that it hasn’t been “updated” correctly for some reason and there's still a previous version). You can get the plug-in version also from the following Maxscript's command (in the case of other 3ds max versions, please adjust it correspondingly):
getFileVersion("C:\ProgramData\Autodesk\ApplicationPlugins\RailClonePro2023\Contents\plugins\2023\RailClonePro.dlo")
Thanks in advance for any further comments on this issue you can share about it with us / our user community (in case some user(s) will run into similar troubles).
Best regards,