Hi Artemis123 -
There is indeed a standard transition called "Slide Spin Horizontal", listed in Transitions under the "Stripe" tag (and "All" of course).
I've never heard of a transition disappearing like that!
I don't mean to doubt your word, but what happens if you close PDR15 then re-open your project? Is it still gone? How many transitions are listed under the "Stripe" tag? There are 4 here.
Cheers - Tony
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