Comment 2 for bug 624850

I can see that OpenShot already contains a loop to check for missing files when a project is opened. However, it only currently checks for missing project files (which are displayed in the Project Files list).

I've attached a patch which also checks the transitions in the project file, and it displays a similar warning message.

It doesn't automatically change any paths, but at least it can provide a hint to the user before the application segfaults.