Cant Start Flow anymore in New Designer.

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Posted on by JG-13040905-0

Hey,

wanted to know if something changed with Power Automate.

My Flow (that is quite big and yea i wanted to split it into smaller Flows) worked normally last week in the New Designer.

Since last Wednesday when i open the Flow it Crashes in every Browser after Loading. I can work in the Classic Designer but was just wondering if something changed.

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Building flows

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Riyaz_riz11 4,204 Super User 2026 Season 1 on at

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Hi,

This is likely a bug in the new designer of Microsoft Power Automate, use the Classic Designer for now it’s stable am using more than 5 years.
Try clearing browser cache or using Incognito mode sometimes the new designer crashes due to cached data too, I've experienced crashing in the new designer.
Large flows can cause issues split your flow into smaller flows this will prevent crashes creating parent child workflows.
If the issue continues, you can also rraise a Microsoft support ticket recent updates sometimes break the new designer temporarily.

If I have answered your question, please mark it as the preferred solution ✅ . If you like my response, please give it a Thumbs Up 👍.
Regards,
Riyaz

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EG-15041410-0 2 on at

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I am experiencing the same thing. Can't even edit the flow before the page crashes, and this has been stable for months prior. I will try the old designer, but seriously, they need to allocate more memory, the designer is unacceptably under powered right now. I should be able to edit existing flows that have been stable for months without issues, and in the last week, I can't even open them for editing successfully. If I had a viable alternative, I would explore it.

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CJ-23041552-0 2 on at

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i am having the same problem, it was always very slow to edit, but now i cant open it at all

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PE-11050931-0 2 on at

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I am experiencing exactly the same issue, and I honestly cannot accept that the recommended solution is to simply switch back to the old editor. That doesn’t feel like a real fix, but rather a workaround that avoids addressing the actual problem.

The new editor is supposed to improve the overall experience, but at the moment this bug makes it extremely frustrating to work with. Reverting to legacy functionality shouldn’t be the long‑term answer.

Is there any official status on an upcoming update that will resolve this issue? It would be really helpful to know whether this is already acknowledged internally and if a proper fix is planned, because in its current state this bug significantly impacts usability.

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CT-02060604-0 2 on at

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i have exactly the same issue. tried connecting incognito, clearing out cache etc... didnt work.

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SL-01061602-0 5 on at

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The issue of freezing flows and browser tabs stems from the use of the dataverse connector inside of the flow. Other flows without dataverse connector open up just fine.

The workaround of using the classic designer is not feasible, since the tab already freezes after opening! Also, for me at least the issue is NOT connected to large flows.

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