Moving a part of a blend with any Selection tool makes it move faster than expected
In 29.7.1 (and Beta 29.9.0.6) when I move one object in a blend with any selection tool, inside or outside of isolation, it moves twice as much.
This is similar to this problem with symbols — http://illustrator.uservoice.com/forums/601447/suggestions/50293512

Seems to work as expected in Beta 30.0.0.72 — moving an object now works as expected. Please try to update and verify if it’s safe to be pushed into General build
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Stefan commented
When repositioning one of the objects in a blend, the object is moved away from the position where the mouse is released. See attached video.
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Sean Grady commented
@Egor - Can confirm, it's working properly in the beta again as far as movement goes! I will say that the live preview can sometimes not work when copying objects within the blend itself, but it's minor and does not affect the functionality. History is also operating correctly, so I can see all steps that I'm taking, no extras, and they work correctly when undoing. :)
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Margaret Trauth commented
I'm just gonna add a note here that this only happens when real-time preview is on, which feels like something potentially really helpful in narrowing down where to look for the problem!
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Sean Grady commented
I originally reported this on the forum and a post. Originally, I though this was due to snapping. If you're searching for "Blend Object" and "Snapping Randomly", then hopefully, you'll find this post!
Thanks Margaret. :)
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Margaret Trauth commented
Good morning, here is some extremely unexpected behavior when editing a blend with real-time preview on. History is absolutely spammed with 'undo' operations while you're moving a sub-object of the blend, and when you let go, it moves twice as far as you dragged it.
More details in the attached file, original report is at https://www.reddit.com/r/AdobeIllustrator/comments/1nia2zk/blend_wont_let_me_move_objects_where_it_should/
- reported on 28.9.1 on Windows 10, I repro'd it on 28.9.1 on Sonoma.
As a further note, although my repro file doesn't have a spine for the blend, this does *not* happen if you drag around the blend spline with real-time preview on. You also don't get a real-time preview of the changes, curiously enough.