Cant open micro/nanoflow

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Hi,   When I try to open any microflow or nanoflow in studio pro I get folowing: I tried reinstalling Mendix, restarted my computer,... My internet connection also works fine. Does somebody know what can be the issue?   Kind regards, Steven
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9 answers
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Uninstall Windows update KB5066835 and Mendix Studio Pro will work normally again. 

 

Select Start  > Settings  > Windows Update . Under Related settings, select Update history > Uninstall updates 

 

It's worth noting that the flaw isn't Mendix fault, but Microsoft. This update (KB5066835) generally impacted localhost applications: https://stackoverflow.com/questions/79790827/localhost-applications-failing-after-installing-2025-10-cumulative-update-for-w

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5

I had the exact same problem and managed to fix it by removing the Windows updates that were installed today.

 

Check if your system was automatically updated yesterday or today, and try uninstalling those updates.

 

Select Start  > Settings  > Windows Update . Under Related settings, select Update history > Uninstall updates 

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2

My assumption: recent Windows updates (KB5066131 & KB5066835, Oct 2025) changed .NET and OS security, causing Mendix Studio Pro/WebView2 errors (see Mendix Studio Log - “No directory at”, failed browser views). Edge WebView2 is used by Mendix to render the Microflow pages. 

If you’re getting these errors, just temporarily uninstalling the updates and wait for a patch information.

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I have the same on 10 version, it work fine on 9 version.

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I have the same problem after a windows update. Looks like something to do with the firewall settings?

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I think this network problem isn’t related to Mendix. Please check with your IT department to see if there’s any VPN issue in the network.

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Same issue for me.. very annoying.

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I've faced this issue today, since my machine pulled the update for KB5066128, and this made me face the same issues related in this post.

I've revisited the windows update page and I still had there a chance to manually install again the KB5066128 and another one, KB5066835. After manually forcing the installation of these two, I just had to restart my machine and now my studio pro in version 10.24.2 is working normally.

 

Hope it helps.

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-2

Hey,

This issue usually happens when Studio Pro’s local cache or connection to the version control server gets corrupted. Try closing Studio Pro, deleting the .deployment, deployment, and userlib folders, then reopen your app. If it still happens, clear the Mendix folder under C:\Users\<YourUserName>\AppData\Local\Mendix\ and restart.

If that doesn’t help, download a fresh copy from the Team Server — that usually fixes it.

 

Regards

Reemali

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