Forum Discussion
New in Storyline 360: Text Autofit Enhancements
A Storyline source file only appears to be tagged as using Text Scrollbars (thus breaking compatibility) if it is either created in v3.52 as a new file or the file is 'upgraded' using the new button in Format Shape | Text Box.
So I'd suggest a viable workaround for now for anyone concerned with retaining compatibility would be to create a basic blank file using v3.51 or earlier, save it and then use a copy of that file as the basis for new projects. I've tried importing a PPT into such a file using v3.52 - the new auto-fit buttons do not appear and once saved the file still opens in earlier SL versions.
In practice I almost never begin a new project from scratch anyway and prefer to clone older projects as a starting point to avoid having to spend hours recreating complex functionality, so hopefully this issue, though annoying, will not actually impact my work too much.