Thanks for the reply! The logout/reboot/login did not help, but I found the FTP downloads to work fine. The objects were then faulty, but just because of Trainz-build number. The old error "This asset has a trainz-build number which is not recognised by this tool". So I got brave and edited the text files to change the number from 4.3 to 3.1 and re-commit the objects, and now the three wall splines I want to use all work great! Thanks so much for creating them!