# Ch 4: Debugging Preview not working in Xcode 12.5 + Challenge solution doesn't work

**URL:** <https://forums.kodeco.com/t/ch-4-debugging-preview-not-working-in-xcode-12-5-challenge-solution-doesnt-work/141031>\
**Category:** SwiftUI by Tutorials\
**Created:** [May 27, 2021, 4:10pm UTC](https://forums.kodeco.com/t/ch-4-debugging-preview-not-working-in-xcode-12-5-challenge-solution-doesnt-work/141031 "2021-05-27T16:10:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![appelflap](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/appelflap/32/81494_2.png) [@appelflap](https://forums.kodeco.com/u/appelflap)\
**Post date:** [May 27, 2021, 4:10pm UTC](https://forums.kodeco.com/t/ch-4-debugging-preview-not-working-in-xcode-12-5-challenge-solution-doesnt-work/141031/1 "2021-05-27T16:10:41Z")

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Anyone else having this problem? Selecting Debugging Preview in the canvas will not stop at a particular breakpoint. No problems however when running it on a simulator.

Also, the test for double tapping to clear the memory display (Challenge) fails on the Mac. The conditional swipe works though on non-macCatalyst targets.

Probably bugs…

Xcode 12.5, macOS 11.4

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**Author:** ![bmorefield](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/bmorefield/32/111506_2.png) [@bmorefield](https://forums.kodeco.com/u/bmorefield)\
**Post date:** [June 2, 2021, 5:17pm UTC](https://forums.kodeco.com/t/ch-4-debugging-preview-not-working-in-xcode-12-5-challenge-solution-doesnt-work/141031/2 "2021-06-02T17:17:08Z")

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Debugging preview usually works, but I’ve seen that before. My experience has been closing and opening Xcode often fixes it.

I would call the other issue a bug as the double tap doesn’t seem to translate in the UI test. Hopefully next week we get some fixed both these.