I installed to test it but I don't see the option to use it in FX or script anywhere. It appears installed in preferences but I don't see how to use it anywhere
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Well that's probably where the issue comes from. 1.3 adds alot of features to the aseprite api and I've potentially used some of them. I will look into this asap.
I personally never had any issues with the 1.3 beta, so if you don't rely on plugins only compatible with 1.2.4, I'd recommend you give the beta a shot :)
Thanks for bringing this to my attention!