Warp options preview malfunction Illustrator 22.0.1 PC version
When using the Warp Options dialog, unchecking the Preview box does not show the original object form (doesn't do anything). Then with the preview button unchecked, if I change to a different warp style, the object remains in the previously-selected style until I check the preview box.

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Can you check this one? Does it work aby better than it used to?
There is a general problem about disabling Preview for effects (http://illustrator.uservoice.com/forums/601447/suggestions/38970259), but when I check Warp effects specifically — these do change for me. Do these for you? -
Sun S commented
Me too, I check preview and the warp preview doesnt work no matter where I move my slider for the effect
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helal commented
Yes, It's not working in my pc. AI 2020 25v. Win 10.
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Duc commented
Even though I have checked the box to show previews for the Warp effect, changing styles does not show a preview of the styles. The only preview that is shown is the very first style that was chosen.
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Alissa Beddow commented
I'm also having this problem with v24.1. No changes preview when adjusting controls (Apply Effects > Warp) or switching between effects. Uninstalled / reinstalled and it's still not working.
Update: Chatted with Adobe ... they had me trash my preferences and restart the application ... problem solved!
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Iain Anderson commented
I'm still seeing this behaviour in the current shipping version of Illustrator, v24.1. Apply Effects > Warp and Preview doesn't work.