I would expect a new thread from Tony on this before too long. The patch was a small one so I would guess a maintenance update rather than any new "whizz-bang" features.
Have you submitted a bug report with details of how to reproduce the issue? Trainz Bug Report
I would concentrate on things like scripted signals, save games, where the camera is positioned - anything that can lead to differences in which data is streamed in.
Checked with QA - reply on April 14 is waiting your new link...
"The Session.cdp has been successfully downloaded, however the 22 Russell.cdp link did not work. Are you able to resend it or provide a fresh link? "
You'll also need to ensure that any non-DLS or built in dependencies are linked as well (e.g. a bunch of stuff from author Barn: <kuid:177548:9938230> )