I created a new template in 2.11.50, with the intention to repeatedly create trailer DCPs with subtitles overlaid on them.
So I created a new project, added an SRT file, adjusted sub position and size, and saved as project, as well as template.
Now, when I create a new project from this template, the previous subtitle file is not part of the template, but when I reload it, the position and size is restored from the template. Good.
However, when I now add a commercial trailer DCP, I get a crash (see attached screenshot). Loading just this trailer into any new or existing project is no problem. When I create a new project, load the SRT, adjust position and scaling, then load the DCP trailer, no problem. So it must be related to the project template.