How new does the game need to be for graphics to work and not break inscriptions?
Not sure if I've been clear.
Old = Non-beta (currently live, non-graphics) creator that everyone uses now.
New = Beta version of the creator at the beta URL.
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ALL OLD GAMES WILL WORK... as long as you don't load them in the new creator and save them, then open them in the old creator. Once you save them in the NEW creator, they are converted to the new data format. Therefore, if you then open them in the old creator, some data will not appear.
ALL NEW GAMES WILL WORK. But, they are in the NEW data format. If you open them in the old creator, some data will not appear.
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Finally, some early NEW games were corrupted by a bug (which is now fixed) that caused text and links to burst tiles and closers to be lost. That is probably the source of most confusion. Those games can be fixed by simply re-entering the text and re-establishing the links.
Hope this makes sense. Sorry for the inconvenience, but that's all part of the beta process.