Cascadian freezes TSC on opening

Hi all.
I haven't visited the Cascadian route in over a year. I just found that trying to play a scenario, editing a scenario, or even the route itself, it just hangs on opening (while showing some splash screenshot) and does not move anymore. Even the sliding bar at the bottom stops. It just freezes and sits there until I force close it via Task Manager.
I've tried to clear the cache and reinstall it. No joy.
Has anyone else experienced this? Any known solutions?
I haven't visited the Cascadian route in over a year. I just found that trying to play a scenario, editing a scenario, or even the route itself, it just hangs on opening (while showing some splash screenshot) and does not move anymore. Even the sliding bar at the bottom stops. It just freezes and sits there until I force close it via Task Manager.
I've tried to clear the cache and reinstall it. No joy.
Has anyone else experienced this? Any known solutions?