OK, I am having an issue where adding anything to my custom assets folder results in SMR CTDing but only in certain situations.
It doesn't matter what I add, be it maps, locos, logos, etc, it will result in a CTD.
But only if I play one of the pre-included scenarios. The game won't CTD if I play a custom map.

Removing the custom stuff from my custom assets folder results in SMR not crashing any more.
I have the game set to XP SP 3 compatibility mode and have the 3GB enabler installed. My game, though, is installed on my F drive with the user data being stored in my D drive - not sure if that causes the issue.
If anyone has any ideas why this is happening I'd appreciate it.
McB