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Editorial Team
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Asked: 2026-06-13T08:27:20+00:00

I have a perfectly working application (exe with around 16 DLLs) when building in

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I have a perfectly working application (exe with around 16 DLLs) when building in Debug mode. However, as soon as I switch to Release, get the exe and all DLLs built, all required DLLs copied over from the QtSDK bin, I’m getting a runtime error.

How exactly am I supposed to troubleshoot what’s happening? Is this a common issue? I don’t get any entry points, etc., to even start from.. just a generic runtime error.

The only similar question I’ve found is here, but this is from a much older version of Qt. 4.7.4 only has one bin folder.

Edit 1 – I’ve commented everything out of my main.cpp except creating my MainWindow object, and everything out of my MainWindow constructor, so it should just be opening an empty window – still the Runtime Library issue.

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Note – Keeping it in release mode and starting the debugger launches the application fine.
Debug -> Start and Debug External Application also results in this Runtime Library error.

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1 Answer

  1. Editorial Team

    My apologies everyone. It appears the QtSingleApplication libraries aren’t working correctly. I had implemented this to force any files I open to open into the one instance. I’ve recompiled it and it still isn’t working, but just using a QApplication seems to have resolved the Runtime Library. I’ll have to look into the QtSingleApplication a bit more and see why it’s being a pain.

    Thanks for the quick comments regardless 🙂

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